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Author	Vijayakumar, J.; Savchenko, T.M.; Bracher, D.M.; Lumbeeck, G.; Béché, A.; Verbeeck, J.; Vajda, Š.; Nolting, F.; Vaz, Ca.f.; Kleibert, A.
Title	Absence of a pressure gap and atomistic mechanism of the oxidation of pure Co nanoparticles			Type	A1 Journal article
Year	2023	Publication	Nature communications	Abbreviated Journal	Nat Commun
Volume	14	Issue	1	Pages	174
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Understanding chemical reactivity and magnetism of 3<italic>d</italic>transition metal nanoparticles is of fundamental interest for applications in fields ranging from spintronics to catalysis. Here, we present an atomistic picture of the early stage of the oxidation mechanism and its impact on the magnetism of Co nanoparticles. Our experiments reveal a two-step process characterized by (i) the initial formation of small CoO crystallites across the nanoparticle surface, until their coalescence leads to structural completion of the oxide shell passivating the metallic core; (ii) progressive conversion of the CoO shell to Co<sub>3</sub>O<sub>4</sub>and void formation due to the nanoscale Kirkendall effect. The Co nanoparticles remain highly reactive toward oxygen during phase (i), demonstrating the absence of a pressure gap whereby a low reactivity at low pressures is postulated. Our results provide an important benchmark for the development of theoretical models for the chemical reactivity in catalysis and magnetism during metal oxidation at the nanoscale.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000955726400021	Publication Date	2023-01-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	2041-1723	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	16.6	Times cited	1	Open Access	OpenAccess
Notes	Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, 200021160186 2002153540 ; EC \| Horizon 2020 Framework Programme, 810310 823717 ; University of Basel \| Swiss Nanoscience Institute, P1502 ; This work is funded by Swiss National Foundation (SNF) (Grants. No 200021160186 and 2002153540) and the Swiss Nanoscience Institut (SNI) (Grant No. SNI P1502). S.V. acknowledges support from the European Union’s Horizon 2020 research and innovation programme under grant agreement no. 810310, which corresponds to the J. Heyrovsky Chair project (“ERA Chair at J. Heyrovský Institute of Physical Chemistry AS CR – The institutional approach towards ERA”). The funders had no role in the preparation of the article. Part of this work was performed at the Surface/Interface: Microscopy (SIM) beamline of the Swiss Light Source (SLS), Paul Scherrer Institut, Villigen, Switzerland. We kindly acknowledge Anja Weber and Elisabeth Müller from PSI for their help in fabricating the sample markers. A.B. and J. Verbeeck received funding from the European Union’s Horizon 2020 Research Infrastructure – Integrating Activities for Advanced Communities under grant agreement No. 823717 – ESTEEM3 reported			Approved	Most recent IF: 16.6; 2023 IF: 12.124
Call Number	EMAT @ emat @c:irua:196738			Serial	8804
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Author	Denisov, N.; Jannis, D.; Orekhov, A.; Müller-Caspary, K.; Verbeeck, J.
Title	Characterization of a Timepix detector for use in SEM acceleration voltage range			Type	A1 Journal article
Year	2023	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	253	Issue		Pages	113777
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Hybrid pixel direct electron detectors are gaining popularity in electron microscopy due to their excellent properties. Some commercial cameras based on this technology are relatively affordable which makes them attractive tools for experimentation especially in combination with an SEM setup. To support this, a detector characterization (Modulation Transfer Function, Detective Quantum Efficiency) of an Advacam Minipix and Advacam Advapix detector in the 15–30 keV range was made. In the current work we present images of Point Spread Function, plots of MTF/DQE curves and values of DQE(0) for these detectors. At low beam currents, the silicon detector layer behaviour should be dominant, which could make these findings transferable to any other available detector based on either Medipix2, Timepix or Timepix3 provided the same detector layer is used.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	001026912700001	Publication Date	2023-06-08
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991	ISBN		Additional Links	UA library record; WoS full record
Impact Factor	2.2	Times cited		Open Access	OpenAccess
Notes	The authors acknowledge the financial support of the Research Foundation Flanders (FWO, Belgium) project SBO S000121N. The authors are grateful to Dr. Lobato for productive discussion of methods.			Approved	Most recent IF: 2.2; 2023 IF: 2.843
Call Number	EMAT @ emat @c:irua:198258			Serial	8815
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Author	Van den Broek, W.; Jannis, D.; Verbeeck, J.
Title	Convexity constraints on linear background models for electron energy-loss spectra			Type	A1 Journal Article
Year	2023	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	254	Issue		Pages	113830
Keywords	A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ;
Abstract	In this paper convexity constraints are derived for a background model of electron energy loss spectra (EELS) that is linear in the fitting parameters. The model outperforms a power-law both on experimental and simulated backgrounds, especially for wide energy ranges, and thus improves elemental quantification results. Owing to the model’s linearity, the constraints can be imposed through fitting by quadratic programming. This has important advantages over conventional nonlinear power-law fitting such as high speed and a guaranteed unique solution without need for initial parameters. As such, the need for user input is significantly reduced, which is essential for unsupervised treatment of large datasets. This is demonstrated on a demanding spectrum image of a semiconductor device sample with a high number of elements over a wide energy range.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos		Publication Date	2023-08-15
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991	ISBN		Additional Links	UA library record
Impact Factor	2.2	Times cited		Open Access	Not_Open_Access
Notes	ECSEL, 875999 ; Horizon 2020; Horizon 2020 Framework Programme; Electronic Components and Systems for European Leadership;			Approved	Most recent IF: 2.2; 2023 IF: 2.843
Call Number	EMAT @ emat @c:irua:200588			Serial	8961
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Author	Grünewald, L.; Chezganov, D.; De Meyer, R.; Orekhov, A.; Van Aert, S.; Bogaerts, A.; Bals, S.; Verbeeck, J.
Title	In Situ Plasma Studies Using a Direct Current Microplasma in a Scanning Electron Microscope			Type	A1 Journal Article
Year	2024	Publication	Advanced Materials Technologies	Abbreviated Journal	Adv Materials Technologies
Volume		Issue		Pages
Keywords	A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ;
Abstract	Microplasmas can be used for a wide range of technological applications and to improve the understanding of fundamental physics. Scanning electron microscopy, on the other hand, provides insights into the sample morphology and chemistry of materials from the mm‐ down to the nm‐scale. Combining both would provide direct insight into plasma‐sample interactions in real‐time and at high spatial resolution. Up till now, very few attempts in this direction have been made, and significant challenges remain. This work presents a stable direct current glow discharge microplasma setup built inside a scanning electron microscope. The experimental setup is capable of real‐time in situ imaging of the sample evolution during plasma operation and it demonstrates localized sputtering and sample oxidation. Further, the experimental parameters such as varying gas mixtures, electrode polarity, and field strength are explored and experimental<italic>V</italic>–<italic>I</italic>curves under various conditions are provided. These results demonstrate the capabilities of this setup in potential investigations of plasma physics, plasma‐surface interactions, and materials science and its practical applications. The presented setup shows the potential to have several technological applications, for example, to locally modify the sample surface (e.g., local oxidation and ion implantation for nanotechnology applications) on the µm‐scale.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	001168639900001	Publication Date	2024-02-25
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	2365-709X	ISBN		Additional Links	UA library record; WoS full record
Impact Factor	6.8	Times cited		Open Access	OpenAccess
Notes	L.G., S.B., and J.V. acknowledge support from the iBOF-21-085 PERsist research fund. D.C., S.V.A., and J.V. acknowledge funding from a TOPBOF project of the University of Antwerp (FFB 170366). R.D.M., A.B., and J.V. acknowledge funding from the Methusalem project of the University of Antwerp (FFB 15001A, FFB 15001C). A.O. and J.V. acknowledge funding from the Research Foundation Flanders (FWO, Belgium) project SBO S000121N.			Approved	Most recent IF: 6.8; 2024 IF: NA
Call Number	EMAT @ emat @c:irua:204363			Serial	8995
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Author	Ignatova, K.; Vlasov, E.; Seddon, S.D.; Gauquelin, N.; Verbeeck, J.; Wermeille, D.; Bals, S.; Hase, T.P.A.; Arnalds, U.B.
Title	Phase coexistence induced surface roughness in V2O3/Ni magnetic heterostructures			Type	A1 Journal Article
Year	2024	Publication	APL Materials	Abbreviated Journal
Volume	12	Issue	4	Pages
Keywords	A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ;
Abstract	We present an investigation of the microstructure changes in V2O3 as it goes through its inherent structural phase transition. Using V2O3 films with a well-defined crystal structure deposited by reactive magnetron sputtering on r-plane Al2O3 substrates, we study the phase coexistence region and its impact on the surface roughness of the films and the magnetic properties of overlying Ni magnetic layers in V2O3/Ni hybrid magnetic heterostructures. The simultaneous presence of two phases in V2O3 during its structural phase transition was identified with high resolution x-ray diffraction and led to an increase in surface roughness observed using x-ray reflectivity. The roughness reaches its maximum at the midpoint of the transition. In V2O3/Ni hybrid heterostructures, we find a concomitant increase in the coercivity of the magnetic layer correlated with the increased roughness of the V2O3 surface. The chemical homogeneity of the V2O3 is confirmed through transmission electron microscopy analysis. High-angle annular dark field imaging and electron energy loss spectroscopy reveal an atomically flat interface between Al2O3 and V2O3, as well as a sharp interface between V2O3 and Ni.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	001202661800003	Publication Date	2024-04-01
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	2166-532X	ISBN		Additional Links	UA library record; WoS full record
Impact Factor	6.1	Times cited		Open Access
Notes	This work was supported by the funding from the University of Iceland Research Fund, the Icelandic Research Fund Grant No. 207111. Instrumentation funding from the Icelandic Infrastructure Fund is acknowledged. This work was based on experiments per- formed at the BM28 (XMaS) beamline at the European Synchrotron Radiation Facility, Grenoble, France. XMaS is a National Research Facility funded by the UK EPSRC and managed by the Universi- ties of Liverpool and Warwick. This project has received funding from the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 823717—ESTEEM3.			Approved	Most recent IF: 6.1; 2024 IF: 4.335
Call Number	EMAT @ emat @c:irua:205569			Serial	9120
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Author	Vlasov, E.; Heyvaert, W.; Ni, B.; Van Gordon, K.; Girod, R.; Verbeeck, J.; Liz-Marzán, L.M.; Bals, S.
Title	High-Throughput Morphological Chirality Quantification of Twisted and Wrinkled Gold Nanorods			Type	A1 Journal Article
Year	2024	Publication	ACS Nano	Abbreviated Journal	ACS Nano
Volume		Issue		Pages
Keywords	A1 Journal Article; Electron Microscopy for Materials Science (EMAT) ;
Abstract	Chirality in gold nanostructures offers an exciting opportunity to tune their differential optical response to left- and right-handed circularly polarized light, as well as their interactions with biomolecules and living matter. However, tuning and understanding such interactions demands quantification of the structural features that are responsible for the chiral behavior. Electron tomography (ET) enables structural characterization at the single-particle level and has been used to quantify the helicity of complex chiral nanorods. However, the technique is time-consuming and consequently lacks statistical value. To address this issue, we introduce herein a high-throughput methodology that combines images acquired by secondary electron-based electron beam-induced current (SEEBIC) with quantitative image analysis. As a result, the geometric chirality of hundreds of nanoparticles can be quantified in less than 1 h. When combining the drastic gain in data collection efficiency of SEEBIC with a limited number of ET data sets, a better understanding of how the chiral structure of individual chiral nanoparticles translates into the ensemble chiroptical response can be reached.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos		Publication Date	2024-04-26
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1936-0851	ISBN		Additional Links
Impact Factor	17.1	Times cited		Open Access
Notes	The authors acknowledge financial support by the European Research Council (ERC CoG No. 815128 REALNANO to S.B.) and from MCIN/AEI/10.13039/501100011033 (Grant PID2020-117779RB-I00 to L.M.L.-M and FPI Fellowship PRE2021-097588 to K.V.G.). Funded by the European Union under Project 101131111 − DELIGHT, JV acknowledges the eBEAM project supported by the European Union’s Horizon 2020 research and innovation program FETPROACT-EIC-07- 2020: emerging paradigms and communities.			Approved	Most recent IF: 17.1; 2024 IF: 13.942
Call Number	EMAT @ emat @			Serial	9121
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Author	Ni, S.; Houwman, E.; Gauquelin, N.; Chezganov, D.; Van Aert, S.; Verbeeck, J.; Rijnders, G.; Koster, G.
Title	Stabilizing perovskite Pb(Mg_0.33Nb_0.67)O₃-PbTiO₃ thin films by fast deposition and tensile mismatched growth template			Type	A1 Journal article
Year	2024	Publication	ACS applied materials and interfaces	Abbreviated Journal
Volume	16	Issue	10	Pages	12744-12753
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Because of its low hysteresis, high dielectric constant, and strong piezoelectric response, Pb(Mg1/3Nb2/3)O-3-PbTiO3 (PMN-PT) thin films have attracted considerable attention for the application in PiezoMEMS, field-effect transistors, and energy harvesting and storage devices. However, it remains a great challenge to fabricate phase-pure, pyrochlore-free PMN-PT thin films. In this study, we demonstrate that a high deposition rate, combined with a tensile mismatched template layer can stabilize the perovskite phase of PMN-PT films and prevent the nucleation of passive pyrochlore phases. We observed that an accelerated deposition rate promoted mixing of the B-site cation and facilitated relaxation of the compressively strained PMN-PT on the SrTiO3 (STO) substrate in the initial growth layer, which apparently suppressed the initial formation of pyrochlore phases. By employing La-doped-BaSnO3 (LBSO) as the tensile mismatched buffer layer, 750 nm thick phase-pure perovskite PMN-PT films were synthesized. The resulting PMN-PT films exhibited excellent crystalline quality close to that of the STO substrate.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	001176343700001	Publication Date	2024-02-29
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1944-8244	ISBN		Additional Links	UA library record; WoS full record
Impact Factor	9.5	Times cited		Open Access
Notes	We would like to acknowledge the Netherlands Organization for Scientific Research (NWO) for the financial support of this work. This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No. 823717-ESTEEM3.			Approved	Most recent IF: 9.5; 2024 IF: 7.504
Call Number	UA @ admin @ c:irua:204754			Serial	9174
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Author	Tan, H.; Turner, S.; Yucelen, E.; Verbeeck, J.; Van Tendeloo, G.
Title	2D atomic mapping of oxidation states in transition metal oxides by scanning transmission electron microscopy and electron energy-loss spectroscopy : reply			Type	Editorial
Year	2012	Publication	Physical review letters	Abbreviated Journal	Phys Rev Lett
Volume	108	Issue	25	Pages	259702
Keywords	Editorial; Electron microscopy for materials research (EMAT)
Abstract
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000305568700038	Publication Date	2012-06-19
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0031-9007	ISBN		Additional Links	UA library record; WoS full record
Impact Factor	8.462	Times cited		Open Access
Notes				Approved	Most recent IF: 8.462; 2012 IF: 7.943
Call Number	UA @ admin @ c:irua:100293			Serial	5370
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Author	Tan, H.; Turner, S.; Yücelen, E.; Verbeeck, J.; Van Tendeloo, G.
Title	2D atomic mapping of oxidation states in transition metal oxides by scanning transmission electron microscopy and electron energy-loss spectroscopy			Type	A1 Journal article
Year	2011	Publication	Physical review letters	Abbreviated Journal	Phys Rev Lett
Volume	107	Issue	10	Pages	107602
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Using a combination of high-angle annular dark-field scanning transmission electron microscopy and atomically resolved electron energy-loss spectroscopy in an aberration-corrected transmission electron microscope we demonstrate the possibility of 2D atom by atom valence mapping in the mixed valence compound Mn3O4. The Mn L2,3 energy-loss near-edge structures from Mn2+ and Mn3+ cation sites are similar to those of MnO and Mn2O3 references. Comparison with simulations shows that even though a local interpretation is valid here, intermixing of the inelastic signal plays a significant role. This type of experiment should be applicable to challenging topics in materials science, such as the investigation of charge ordering or single atom column oxidation states in, e.g., dislocations.
Address
Corporate Author				Thesis
Publisher		Place of Publication	New York, N.Y.	Editor
Language		Wos	000294406600018	Publication Date	2011-09-01
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0031-9007;1079-7114;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	8.462	Times cited	115	Open Access
Notes	Esteem 026019; Fwo			Approved	Most recent IF: 8.462; 2011 IF: 7.370
Call Number	UA @ lucian @ c:irua:91265 c:irua:91265 c:irua:91265UA @ admin @ c:irua:91265			Serial	5
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Author	Turner, S.; Shenderova, O.; da Pieve, F.; Lu, Y.-G.; Yücelen, E.; Verbeeck, J.; Lamoen, D.; Van Tendeloo, G.
Title	Aberration-corrected microscopy and spectroscopy analysis of pristine, nitrogen containing detonation nanodiamond			Type	A1 Journal article
Year	2013	Publication	Physica status solidi : A : applications and materials science	Abbreviated Journal	Phys Status Solidi A
Volume	210	Issue	10	Pages	1976-1984
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Aberration-corrected transmission electron microscopy, electron energy-loss spectroscopy, and density functional theory (DFT) calculations are used to solve several key questions about the surface structure, the particle morphology, and the distribution and nature of nitrogen impurities in detonation nanodiamond (DND) cleaned by a recently developed ozone treatment. All microscopy and spectroscopy measurements are performed at a lowered acceleration voltage (80/120kV), allowing prolonged and detailed experiments to be carried out while minimizing the risk of knock-on damage or surface graphitization of the nanodiamond. High-resolution TEM (HRTEM) demonstrates the stability of even the smallest nanodiamonds under electron illumination at low voltage and is used to image the surface structure of pristine DND. High resolution electron energy-loss spectroscopy (EELS) measurements on the fine structure of the carbon K-edge of nanodiamond demonstrate that the typical * pre-peak in fact consists of three sub-peaks that arise from the presence of, amongst others, minimal fullerene-like reconstructions at the nanoparticle surfaces and deviations from perfect sp(3) coordination at defects in the nanodiamonds. Spatially resolved EELS experiments evidence the presence of nitrogen within the core of DND particles. The nitrogen is present throughout the whole diamond core, and can be enriched at defect regions. By comparing the fine structure of the experimental nitrogen K-edge with calculated energy-loss near-edge structure (ELNES) spectra from DFT, the embedded nitrogen is most likely related to small amounts of single substitutional and/or A-center nitrogen, combined with larger nitrogen clusters.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000329299700025	Publication Date	2013-10-18
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1862-6300;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	1.775	Times cited	37	Open Access
Notes	262348 ESMI; 246791 COUNTATOMS; FWO; Hercules; GOA XANES meets ELNES			Approved	Most recent IF: 1.775; 2013 IF: 1.525
Call Number	UA @ lucian @ c:irua:110821UA @ admin @ c:irua:110821			Serial	41
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Author	Bertoni, G.; Verbeeck, J.
Title	Accuracy and precision in model based EELS quantification			Type	A1 Journal article
Year	2008	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	108	Issue	8	Pages	782-790
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We present results on model based quantification of electron energy loss spectra (EELS), focusing on the factors that influence accuracy and precision in determining chemical concentrations. Several sources of systematical errors are investigated. The spectrometer entrance aperture determines the collection angle, and the effects of its position with respect to the transmitted beam are investigated, taking into account the diffraction by the crystal structure. The effect of the orientation of the sample is tested experimentally and theoretically on SrTiO3, and finally, a simulated experiment on c-BN at different thicknesses confirms the superior results of the model based method with respect to the conventional method. A test on a set of experimental reference compounds is presented, showing that remarkably good accuracy can be obtained. Recommendations are given to achieve high accuracy and precision in practice. (C) 2008 Elsevier B.V. All rights reserved.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000258241900010	Publication Date	2008-02-22
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	44	Open Access
Notes				Approved	Most recent IF: 2.843; 2008 IF: 2.629
Call Number	UA @ lucian @ c:irua:70550UA @ admin @ c:irua:70550			Serial	42
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Author	van den Broek, W.; Verbeeck, J.; de Backer, S.; Scheunders, P.; Schryvers, D.
Title	Acquisition of the EELS data cube by tomographic reconstruction			Type	A1 Journal article
Year	2006	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	106	Issue	4/5	Pages	269-276
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); Vision lab
Abstract	Energy filtered TEM, EFTEM, provides three-dimensional data, two spatial and one spectral dimension. We propose to acquire these data by measuring a series of images with a defocused energy filter. It will be shown that each image is a projection of the data on the detector and that reconstruction of the data out of a sufficient number of such projections using a tomographic reconstruction algorithm is possible. This technique uses only a fraction of the electron dose an energy filtered series (EFS) needs for the same spectral and spatial resolution and the same mean signal-to-noise ratio. (c) 2005 Elsevier B.V. All rights reserved.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000236042300003	Publication Date	2005-11-30
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	6	Open Access
Notes				Approved	Most recent IF: 2.843; 2006 IF: 1.706
Call Number	UA @ lucian @ c:irua:56910UA @ admin @ c:irua:56910			Serial	55
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Author	Lu, Y.-G.; Verbeeck, J.; Turner, S.; Hardy, A.; Janssens, S.D.; De Dobbelaere, C.; Wagner, P.; Van Bael, M.K.; Van Tendeloo, G.
Title	Analytical TEM study of CVD diamond growth on TiO₂ sol-gel layers			Type	A1 Journal article
Year	2012	Publication	Diamond and related materials	Abbreviated Journal	Diam Relat Mater
Volume	23	Issue		Pages	93-99
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The early growth stages of chemical vapor deposition (CVD) diamond on a solgel TiO2 film with buried ultra dispersed diamond seeds (UDD) have been studied. In order to investigate the diamond growth mechanism and understand the role of the TiO2 layer in the growth process, high resolution transmission electron microscopy (HRTEM), energy-filtered TEM and electron energy loss spectroscopy (EELS) techniques were applied to cross sectional diamond film samples. We find evidence for the formation of TiC crystallites inside the TiO2 layer at different diamond growth stages. However, there is no evidence that diamond nucleation starts from these crystallites. Carbon diffusion into the TiO2 layer and the chemical bonding state of carbon (sp2/sp3) were both extensively investigated. We provide evidence that carbon diffuses through the TiO2 layer and that the diamond seeds partially convert to amorphous carbon during growth. This carbon diffusion and diamond to amorphous carbon conversion make the seed areas below the TiO2 layer grow and bend the TiO2 layer upwards to form the nucleation center of the diamond film. In some of the protuberances a core of diamond seed remains, covered by amorphous carbon. It is however unlikely that the remaining seeds are still active during the growth process.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000302887600017	Publication Date	2012-01-26
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0925-9635;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.561	Times cited	16	Open Access
Notes	Iap; Esteem 026019; Fwo			Approved	Most recent IF: 2.561; 2012 IF: 1.709
Call Number	UA @ lucian @ c:irua:95037UA @ admin @ c:irua:95037			Serial	111
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Author	Palgrave, R.G.; Borisov, P.; Dyer, M.S.; McMitchell, S.R.C.; Darling, G.R.; Claridge, J.B.; Batuk, M.; Tan, H.; Tian, H.; Verbeeck, J.; Hadermann, J.; Rosseinsky, M.J.;
Title	Artificial construction of the layered Ruddlesden-Popper manganite La₂Sr₂Mn₃O₁₀ by reflection high energy electron diffraction monitored pulsed laser deposition			Type	A1 Journal article
Year	2012	Publication	Journal of the American Chemical Society	Abbreviated Journal	J Am Chem Soc
Volume	134	Issue	18	Pages	7700-7714
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Pulsed laser deposition has been used to artificially construct the n = 3 Ruddlesden Popper structure La2Sr2Mn3O10 in epitaxial thin film form by sequentially layering La1-xSrxMnO3 and SrO unit cells aided by in situ reflection high energy electron diffraction monitoring. The interval deposition technique was used to promote two-dimensional SrO growth. X-ray diffraction and cross-sectional transmission electron microscopy indicated that the trilayer structure had been formed. A site ordering was found to differ from that expected thermodynamically, with the smaller Sr2+ predominantly on the R site due to kinetic trapping of the deposited cation sequence. A dependence of the out-of-plane lattice parameter on growth pressure was interpreted as changing the oxygen content of the films. Magnetic and transport measurements on fully oxygenated films indicated a frustrated magnetic ground state characterized as a spin glass-like magnetic phase with the glass temperature T-g approximate to 34 K. The magnetic frustration has a clear in-plane (ab) magnetic anisotropy, which is maintained up to temperatures of 150 K. Density functional theory calculations suggest competing antiferromagnetic and ferromagnetic long-range orders, which are proposed as the origin of the low-temperature glassy state.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000303696200029	Publication Date	2012-03-30
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0002-7863;1520-5126;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	13.858	Times cited	27	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 13.858; 2012 IF: 10.677
Call Number	UA @ lucian @ c:irua:98947UA @ admin @ c:irua:98947			Serial	153
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Author	Molina, L.; Tan, H.; Biermans, E.; Batenburg, K.J.; Verbeeck, J.; Bals, S.; Van Tendeloo, G.
Title	Barrier efficiency of sponge-like La₂Zr₂O₇ buffer layers for YBCO-coated conductors			Type	A1 Journal article
Year	2011	Publication	Superconductor science and technology	Abbreviated Journal	Supercond Sci Tech
Volume	24	Issue	6	Pages	065019-065019,8
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); Vision lab
Abstract	Solution derived La2Zr2O7 films have drawn much attention for potential applications as thermal barriers or low-cost buffer layers for coated conductor technology. Annealing and coating parameters strongly affect the microstructure of La2Zr2O7, but different film processing methods can yield similar microstructural features such as nanovoids and nanometer-sized La2Zr2O7 grains. Nanoporosity is a typical feature found in such films and the implications for the functionality of the films are investigated by a combination of scanning transmission electron microscopy (STEM), electron energy-loss spectroscopy (EELS) and quantitative electron tomography. Chemical solution based La2Zr2O7 films deposited on flexible Ni5 at.%W substrates with a {100}lang001rang biaxial texture were prepared for an in-depth characterization. A sponge-like structure composed of nanometer-sized voids is revealed by high-angle annular dark-field scanning transmission electron microscopy in combination with electron tomography. A three-dimensional quantification of nanovoids in the La2Zr2O7 film is obtained on a local scale. Mostly non-interconnected highly faceted nanovoids compromise more than one-fifth of the investigated sample volume. The diffusion barrier efficiency of a 170 nm thick La2Zr2O7 film is investigated by STEM-EELS, yielding a 1.8 ± 0.2 nm oxide layer beyond which no significant nickel diffusion can be detected and intermixing is observed. This is of particular significance for the functionality of YBa2Cu3O7 − δ coated conductor architectures based on solution derived La2Zr2O7 films as diffusion barriers.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Bristol	Editor
Language		Wos	000290472900021	Publication Date	2011-04-20
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0953-2048;1361-6668;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.878	Times cited	31	Open Access
Notes	Esteem 026019; Fwo			Approved	Most recent IF: 2.878; 2011 IF: 2.662
Call Number	UA @ lucian @ c:irua:88639UA @ admin @ c:irua:88639			Serial	221
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Author	Lu, Y.-G.; Turner, S.; Ekimov, E.A.; Verbeeck, J.; Van Tendeloo, G.
Title	Boron-rich inclusions and boron distribution in HPHT polycrystalline superconducting diamond			Type	A1 Journal article
Year	2015	Publication	Carbon	Abbreviated Journal	Carbon
Volume	86	Issue	86	Pages	156-162
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Polycrystalline boron-doped superconducting diamond, synthesized at high pressure and high temperature (HPHT) via a reaction of a single piece of crystalline boron with monolithic graphite, has been investigated by analytical transmission electron microscopy. The local boron distribution and boron environment have been studied by a combination of (scanning) transmission electron microscopy ((S)TEM) and spatially resolved electron energy-loss spectroscopy (EELS). High resolution TEM imaging and EELS elemental mapping have established, for the first time, the presence of largely crystalline diamond-diamond grain boundaries within the material and have evidenced the presence of substitutional boron dopants within individual diamond grains. Confirmation of the presence of substitutional B dopants has been obtained through comparison of acquired boron K-edge EELS fine structures with known references. This confirmation is important to understand the origin of superconductivity in polycrystalline B-doped diamond. In addition to the substitutional boron doping, boron-rich inclusions and triple-points, both amorphous and crystalline, with chemical compositions close to boron carbide B4C, are evidenced. (C) 2015 Elsevier Ltd. All rights reserved.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Oxford	Editor
Language		Wos	000352922700019	Publication Date	2015-01-22
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0008-6223;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.337	Times cited	20	Open Access
Notes	FWO; 246791 COUNTATOMS; 278510 VORTEX; Hercules ECASJO_;			Approved	Most recent IF: 6.337; 2015 IF: 6.196
Call Number	c:irua:125994UA @ admin @ c:irua:125994			Serial	250
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Author	da Pieve, F.; Hogan, C.; Lamoen, D.; Verbeeck, J.; Vanmeert, F.; Radepont, M.; Cotte, M.; Janssens, K.; Gonze, X.; Van Tendeloo, G.
Title	Casting light on the darkening of colors in historical paintings			Type	A1 Journal article
Year	2013	Publication	Physical review letters	Abbreviated Journal	Phys Rev Lett
Volume	111	Issue	20	Pages	208302-208305
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
Abstract	The degradation of colors in historical paintings affects our cultural heritage in both museums and archeological sites. Despite intensive experimental studies, the origin of darkening of one of the most ancient pigments known to humankind, vermilion (α-HgS), remains unexplained. Here, by combining many-body theoretical spectroscopy and high-resolution microscopic x-ray diffraction, we clarify the composition of the damaged paint work and demonstrate possible physicochemical processes, induced by illumination and exposure to humidity and air, that cause photoactivation of the original pigment and the degradation of the secondary minerals. The results suggest a new path for the darkening process which was never considered by previous studies and prompt a critical examination of their findings.
Address
Corporate Author				Thesis
Publisher		Place of Publication	New York, N.Y.	Editor
Language		Wos	000327244500003	Publication Date	2013-11-15
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0031-9007;1079-7114;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	8.462	Times cited	30	Open Access
Notes	Vortex; ERC FP7; COUNTATOMS; ECASJO_;			Approved	Most recent IF: 8.462; 2013 IF: 7.728
Call Number	UA @ lucian @ c:irua:111396UA @ admin @ c:irua:111396			Serial	287
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Author	Abakumov, A.M.; Morozov, V.A.; Tsirlin, A.A.; Verbeeck, J.; Hadermann, J.
Title	Cation ordering and flexibility of the BO₄^2- tetrahedra in incommensurately modulated CaEu₂(BO₄)₄ (B = Mo, W) scheelites			Type	A1 Journal article
Year	2014	Publication	Inorganic chemistry	Abbreviated Journal	Inorg Chem
Volume	53	Issue	17	Pages	9407-9415
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The factors mediating cation ordering in the scheelite-based molybdates and tungstates are discussed on the basis of the incommensurately modulated crystal structures of the CaEu2(BO4)(4) (B = Mo, W) red phosphors solved from high-resolution synchrotron powder X-ray diffraction data. Monoclinic CaEu2(WO4)(4) adopts a (3 + 1)-dimensionally modulated structure [superspace group I2/b(alpha beta 0)00, a = 5.238 73(1)A, b = 5.266 35(1) A, c = 11.463 19(9) A, gamma = 91.1511(2)degrees, q = 0.56153(6)a* + 0.7708(9)b, R-F = 0.050, R-p = 0.069], whereas tetragonal CaEu2(MoO4)(4) is (3 + 2)-dimensionally modulated [superspace group I4(1)/ a(alpha beta 0)00(-beta alpha 0)00, a = 5.238 672(7) A, c = 11.548 43(2) A, q(1) = 035331(8)a + 0.82068(9)b, q(2) = -0.82068(9)a + 0.55331(8)b*, R-F = 0.061, R-p = 0.082]. In both cases the modulation arises from the ordering of the Ca/Eu cations and the cation vacancies at the A-sublattice of the parent scheelite ABO(4) structure. The cation ordering is incomplete and better described with harmonic rather than with steplike occupational modulation functions. The structures respond to the variation of the effective charge and cation size at the A-position through the flexible geometry of the MoO42- and WO42- tetrahedra demonstrating an alternation of stretching the B-O bond lengths and bending the O-B-O bond angles. The tendency towards A-site cation ordering in scheelites is rationalized using the difference in ionic radii and concentration of the A-site vacancies as parameters and presented in the form of a structure map.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Easton, Pa	Editor
Language		Wos	000341229600068	Publication Date	2014-08-21
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0020-1669;1520-510X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	4.857	Times cited	48	Open Access
Notes	Fwo G039211n			Approved	Most recent IF: 4.857; 2014 IF: 4.762
Call Number	UA @ lucian @ c:irua:119292UA @ admin @ c:irua:119292			Serial	297
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Author	Borgatti, F.; Park, C.; Herpers, A.; Offi, F.; Egoavil, R.; Yamashita, Y.; Yang, A.; Kobata, M.; Kobayashi, K.; Verbeeck, J.; Panaccione, G.; Dittmann, R.;
Title	Chemical insight into electroforming of resistive switching manganite heterostructures			Type	A1 Journal article
Year	2013	Publication	Nanoscale	Abbreviated Journal	Nanoscale
Volume	5	Issue	9	Pages	3954-3960
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	We have investigated the role of the electroforming process in the establishment of resistive switching behaviour for Pt/Ti/Pr0.5Ca0.5MnO3/SrRuO3 layered heterostructures (Pt/Ti/PCMO/SRO) acting as non-volatile Resistance Random Access Memories (RRAMs). Electron spectroscopy measurements demonstrate that the higher resistance state resulting from electroforming of as-prepared devices is strictly correlated with the oxidation of the top electrode Ti layer through field-induced electromigration of oxygen ions. Conversely, PCMO exhibits oxygen depletion and downward change of the chemical potential for both resistive states. Impedance spectroscopy analysis, supported by the detailed knowledge of these effects, provides an accurate model description of the device resistive behaviour. The main contributions to the change of resistance from the as-prepared (low resistance) to the electroformed (high resistance) states are respectively due to reduced PCMO at the boundary with the Ti electrode and to the formation of an anisotropic np junction between the Ti and the PCMO layers.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge	Editor
Language		Wos	000317859400051	Publication Date	2013-03-05
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	2040-3364;2040-3372;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	7.367	Times cited	40	Open Access
Notes	Vortex; Countatoms ECASJO_;			Approved	Most recent IF: 7.367; 2013 IF: 6.739
Call Number	UA @ lucian @ c:irua:108710UA @ admin @ c:irua:108710			Serial	348
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Author	Moshnyaga, V.; Damaschke, B.; Shapoval, O.; Belenchuk, A.; Faupel, J.; Lebedev, O.I.; Verbeeck, J.; Van Tendeloo, G.; Mücksch, M.; Tsurkan, V.; Tidecks, R.; Samwer, K.
Title	Corrigendum: Structural phase transition at the percolation threshold in epitaxial (La_0.7Ca_0.3MnO₃)_1-x:(MgO)_x nanocomposite films			Type	A1 Journal article
Year	2005	Publication	Nature materials	Abbreviated Journal	Nat Mater
Volume	4	Issue		Pages	104
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos		Publication Date	0000-00-00
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1476-1122	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	39.737	Times cited		Open Access
Notes				Approved	Most recent IF: 39.737; 2005 IF: 15.941
Call Number	UA @ lucian @ c:irua:54856			Serial	530
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Author	Niermann, T.; Verbeeck, J.; Lehmann, M.
Title	Creating arrays of electron vortices			Type	A1 Journal article
Year	2014	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	136	Issue		Pages	165-170
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We demonstrate the production of an ordered array of electron vortices making use of an electron optical setup consisting of two electrostatic biprisms. The biprism filaments are oriented nearly orthogonal with respect to each other in a transmission electron microscope. Matching the position of the filaments, we can choose to form different topological features in the electron wave. We outline the working principle of the setup and demonstrate fist experimental results. This setup partially bridges the gap between angular momentum carried by electron spin, which is intrinsic and therefore present in any position of the wave, and angular momentum carried by the vortex character of the wave, which can be extrinsic depending on the axis around which it is measured. (C) 2013 Elsevier B.V. All rights reserved.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000327884700021	Publication Date	2013-10-15
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	9	Open Access
Notes	FP7; Countatoms; Vortex ECASJO_;			Approved	Most recent IF: 2.843; 2014 IF: 2.436
Call Number	UA @ lucian @ c:irua:112837UA @ admin @ c:irua:112837			Serial	538
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Author	Morozov, V.A.; Raskina, M.V.; Lazoryak, B.I.; Meert, K.W.; Korthout, K.; Smet, P.F.; Poelman, D.; Gauquelin, N.; Verbeeck, J.; Abakumov, A.M.; Hadermann, J.;
Title	Crystal Structure and Luminescent Properties of R2-xEux(MoO4)(3) (R = Gd, Sm) Red Phosphors			Type	A1 Journal article
Year	2014	Publication	Chemistry of materials	Abbreviated Journal	Chem Mater
Volume	26	Issue	24	Pages	7124-7136
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The R-2(MoO4)(3) (R = rare earth elements) molybdates doped with Eu3+ cations are interesting red-emitting materials for display and solid-state lighting applications. The structure and luminescent properties of the R2-xEux(MoO4)(3) (R = Gd, Sm) solid solutions have been investigated as a function of chemical composition and preparation conditions. Monoclinic (alpha) and orthorhombic (beta') R2-xEux(MoO4)(3) (R = Gd, Sm; 0 <= x <= 2) modifications were prepared by solid-state reaction, and their structures were investigated using synchrotron powder X-ray diffraction and transmission electron microscopy. The pure orthorhombic beta'-phases could be synthesized only by quenching from high temperature to room temperature for Gd2-xEux(MoO4)(3) in the Eu3+-rich part (x > 1) and for all Sm2-xEux(MoO4)(3) solid solutions. The transformation from the alpha-phase to the beta'-phase results in a notable increase (similar to 24%) of the unit cell volume for all R2-xEux(MoO4)(3) (R = Sm, Gd) solid solutions. The luminescent properties of all R2-xEux(MoO4)(3) (R = Gd, Sm; 0 <= x <= 2) solid solutions were measured, and their optical properties were related to their structural properties. All R2-xEux(MoO4)(3) (R = Gd, Sm; 0 <= x <= 2) phosphors emit intense red light dominated by the D-5(0)-> F-7(2) transition at similar to 616 nm. However, a change in the multiplet splitting is observed when switching from the monoclinic to the orthorhombic structure, as a consequence of the change in coordination polyhedron of the luminescent ion from RO8 to RO7 for the alpha- and beta'-modification, respectively. The Gd2-xEux(MoO4)(3) solid solutions are the most efficient emitters in the range of 0 < x < 1.5, but their emission intensity is comparable to or even significantly lower than that of Sm2-xEux(MoO4)(3) for higher Eu3+ concentrations (1.5 <= x <= 1.75). Electron energy loss spectroscopy (EELS) measurements revealed the influence of the structure and element content on the number and positions of bands in the ultraviolet-visible-infrared regions of the EELS spectrum.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000347139700027	Publication Date	2014-11-27
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0897-4756;1520-5002;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	9.466	Times cited	24	Open Access
Notes	Fwo G039211n; G004413n; 278510 Vortex ECASJO_;			Approved	Most recent IF: 9.466; 2014 IF: 8.354
Call Number	UA @ lucian @ c:irua:122829UA @ admin @ c:irua:122829			Serial	558
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Author	Verbeeck, J.; Bertoni, G.
Title	Deconvolution of core electron energy loss spectra			Type	A1 Journal article
Year	2009	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	109	Issue	11	Pages	1343-1352
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Different deconvolution methods for removing multiple scattering and instrumental broadening from core loss electron energy loss spectra are compared with special attention to the artefacts they introduce. The Gaussian modifier method, Wiener filter, maximum entropy, and model based methods are described. Their performance is compared on virtual spectra where the true single scattering distribution is known. A test on experimental spectra confirms the good performance of model based deconvolution in comparison to maximum entropy methods and shows the advantage of knowing the estimated error bars from a single spectrum acquisition.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000270765800005	Publication Date	2009-07-01
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	13	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 2.843; 2009 IF: 2.067
Call Number	UA @ lucian @ c:irua:79073UA @ admin @ c:irua:79073			Serial	610
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Author	Huijben, M.; Koster, G.; Kruize, M.K.; Wenderich, S.; Verbeeck, J.; Bals, S.; Slooten, E.; Shi, B.; Molegraaf, H.J.A.; Kleibeuker, J.E.; Van Aert, S.; Goedkoop, J.B.; Brinkman, A.; Blank, D.H.A.; Golden, M.S.; Van Tendeloo, G.; Hilgenkamp, H.; Rijnders, G.;
Title	Defect engineering in oxide heterostructures by enhanced oxygen surface exchange			Type	A1 Journal article
Year	2013	Publication	Advanced functional materials	Abbreviated Journal	Adv Funct Mater
Volume	23	Issue	42	Pages	5240-5248
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	The synthesis of materials with well-controlled composition and structure improves our understanding of their intrinsic electrical transport properties. Recent developments in atomically controlled growth have been shown to be crucial in enabling the study of new physical phenomena in epitaxial oxide heterostructures. Nevertheless, these phenomena can be influenced by the presence of defects that act as extrinsic sources of both doping and impurity scattering. Control over the nature and density of such defects is therefore necessary to fully understand the intrinsic materials properties and exploit them in future device technologies. Here, it is shown that incorporation of a strontium copper oxide nano-layer strongly reduces the impurity scattering at conducting interfaces in oxide LaAlO3SrTiO3(001) heterostructures, opening the door to high carrier mobility materials. It is proposed that this remote cuprate layer facilitates enhanced suppression of oxygen defects by reducing the kinetic barrier for oxygen exchange in the hetero-interfacial film system. This design concept of controlled defect engineering can be of significant importance in applications in which enhanced oxygen surface exchange plays a crucial role.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000327480900003	Publication Date	2013-06-10
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1616-301X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	12.124	Times cited	87	Open Access
Notes	Countatoms; Vortex; Fwo; Ifox ECASJO_;			Approved	Most recent IF: 12.124; 2013 IF: 10.439
Call Number	UA @ lucian @ c:irua:109273UA @ admin @ c:irua:109273			Serial	615
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Author	Monico, L.; Janssens, K.; Miliani, C.; Brunetti, B.G.; Vagnini, M.; Vanmeert, F.; Falkenberg, G.; Abakumov, A.; Lu, Y.; Tian, H.; Verbeeck, J.; Radepont, M.; Cotte, M.; Hendriks, E.; Geldof, M.; van der Loeff, L.; Salvant, J.; Menu, M.;
Title	Degradation process of lead chromate in paintings by Vincent van Gogh studied by means of spectromicroscopic methods : 3 : synthesis, characterization, and detection of different crystal forms of the chrome yellow pigment			Type	A1 Journal article
Year	2013	Publication	Analytical chemistry	Abbreviated Journal	Anal Chem
Volume	85	Issue	2	Pages	860-867
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
Abstract	The painter, Vincent van Gogh, and some of his contemporaries frequently made use of the pigment chrome yellow that is known to show a tendency toward darkening. This pigment may correspond to various chemical compounds such as PbCrO4 and PbCr1-xSxO4, that may each be present in various crystallographic forms with different tendencies toward degradation. Investigations by X-ray diffraction (XRD), mid-Fourier Transform infrared (FTIR), and Raman instruments (benchtop and portable) and synchrotron radiation-based micro-XRD and X-ray absorption near edge structure spectroscopy performed on oil-paint models, prepared with in-house synthesized PbCrO4 and PbCr1-xSxO4, permitted us to characterize the spectroscopic features of the various forms. On the basis of these results, an extended study has been carried out on historic paint tubes and on embedded paint microsamples taken from yellow-orange/pale yellow areas of 12 Van Gogh paintings, demonstrating that Van Gogh effectively made use of different chrome yellow types. This conclusion was also confirmed by in situ mid-FTIR investigations on Van Goghs Portrait of Gauguin (Van Gogh Museum, Amsterdam).
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000313668400031	Publication Date	2012-10-10
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-2700;1520-6882;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.32	Times cited	79	Open Access
Notes	Goa; Fwo			Approved	Most recent IF: 6.32; 2013 IF: 5.825
Call Number	UA @ lucian @ c:irua:108707UA @ admin @ c:irua:108707			Serial	631
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Author	Monico, L.; van der Snickt, G.; Janssens, K.; de Nolf, W.; Miliani, C.; Verbeeck, J.; Tian, H.; Tan, H.; Dik, J.; Radepont, M.; Cotte, M.
Title	Degradation process of lead chromate in paintings by Vincent van Gogh studied by means of synchrotron X-ray spectromicroscopy and related methods : 1 : artificially aged model samples			Type	A1 Journal article
Year	2011	Publication	Analytical chemistry	Abbreviated Journal	Anal Chem
Volume	83	Issue	4	Pages	1214-1223
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT); AXES (Antwerp X-ray Analysis, Electrochemistry and Speciation)
Abstract	On several paintings by artists of the end of the 19th century and the beginning of the 20th Century a darkening of the original yellow areas, painted with the chrome yellow pigment (PbCrO4, PbCrO4·xPbSO4, or PbCrO4·xPbO) is observed. The most famous of these are the various Sunflowers paintings Vincent van Gogh made during his career. In the first part of this work, we attempt to elucidate the degradation process of chrome yellow by studying artificially aged model samples. In view of the very thin (1−3 μm) alteration layers that are formed, high lateral resolution spectroscopic methods such as microscopic X-ray absorption near edge (μ-XANES), X-ray fluorescence spectrometry (μ-XRF), and electron energy loss spectrometry (EELS) were employed. Some of these use synchrotron radiation (SR). Additionally, microscopic SR X-ray diffraction (SR μ-XRD), μ-Raman, and mid-FTIR spectroscopy were employed to completely characterize the samples. The formation of Cr(III) compounds at the surface of the chrome yellow paint layers is particularly observed in one aged model sample taken from a historic paint tube (ca. 1914). About two-thirds of the chromium that is present at the surface has reduced from the hexavalent to the trivalent state. The EELS and μ-XANES spectra are consistent with the presence of Cr2O3·2H2O (viridian). Moreover, as demonstrated by μ-XANES, the presence of another Cr(III) compound, such as either Cr2(SO4)3·H2O or (CH3CO2)7Cr3(OH)2 [chromium(III) acetate hydroxide], is likely.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000287176900011	Publication Date	2011-02-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-2700;1520-6882;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.32	Times cited	113	Open Access
Notes	Iuap; Fwo			Approved	Most recent IF: 6.32; 2011 IF: 5.856
Call Number	UA @ lucian @ c:irua:88794UA @ admin @ c:irua:88794			Serial	632
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Author	Turner, S.; Lebedev, O.I.; Shenderova, O.; Vlasov, I.I.; Verbeeck, J.; Van Tendeloo, G.
Title	Determination of size, morphology, and nitrogen impurity location in treated detonation nanodiamond by transmission electron microscopy			Type	A1 Journal article
Year	2009	Publication	Advanced functional materials	Abbreviated Journal	Adv Funct Mater
Volume	19	Issue	13	Pages	2116-2124
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Size, morphology, and nitrogen impurity location, all of which are all thought to be related to the luminescent properties of detonation nanodiamonds, are determined in several detonation nanodiamond samples using a combination of transmission electron microscopy techniques. Results obtained from annealed and cleaned detonation nanodiamond samples are compared to results from conventionally purified detonation nanodiamond. Detailed electron energy loss spectroscopy combined with model-based quantification provides direct evidence for the sp3 like embedding of nitrogen impurities into the diamond cores of all the studied nanodiamond samples. Simultaneously, the structure and morphology of the cleaned detonation nanodiamond particles are studied using high resolution transmission electron microscopy. The results show that the size and morphology of detonation nanodiamonds can be modified by temperature treatment and that by applying a special cleaning procedure after temperature treatment, nanodiamond particles with clean facets almost free from sp2 carbon can be prepared. These clean facets are clear evidence that nanodiamond cores are not necessarily in coexistence with a graphitic shell of non-diamond carbon.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000268297800012	Publication Date	2009-05-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1616-301X;1616-3028;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	12.124	Times cited	100	Open Access
Notes	Esteem 026019			Approved	Most recent IF: 12.124; 2009 IF: 6.990
Call Number	UA @ lucian @ c:irua:78261UA @ admin @ c:irua:78261			Serial	674
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Author	Hadermann, J.; Abakumov, A.M.; Tsirlin, A.A.; Filonenko, V.P.; Gonnissen, J.; Tan, H.; Verbeeck, J.; Gemmi, M.; Antipov, E.V.; Rosner, H.
Title	Direct space structure solution from precession electron diffraction data: resolving heavy and light scatterers in Pb₁₃Mn₉O₂₅			Type	A1 Journal article
Year	2010	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	110	Issue	7	Pages	881-890
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The crystal structure of a novel compound Pb13Mn9O25 has been determined through a direct space structure solution with a Monte-Carlo-based global optimization using precession electron diffraction data (a=14.177(3) Å, c=3.9320(7) Å, SG P4/m, RF=0.239) and compositional information obtained from energy dispersive X-ray analysis and electron energy loss spectroscopy. This allowed to obtain a reliable structural model even despite the simultaneous presence of both heavy (Pb) and light (O) scattering elements and to validate the accuracy of the electron diffraction-based structure refinement. This provides an important benchmark for further studies of complex structural problems with electron diffraction techniques. Pb13Mn9O25 has an anion- and cation-deficient perovskite-based structure with the A-positions filled by the Pb atoms and 9/13 of the B positions filled by the Mn atoms in an ordered manner. MnO6 octahedra and MnO5 tetragonal pyramids form a network by sharing common corners. Tunnels are formed in the network due to an ordered arrangement of vacancies at the B-sublattice. These tunnels provide sufficient space for localization of the lone 6s2 electron pairs of the Pb2+ cations, suggested as the driving force for the structural difference between Pb13Mn9O25 and the manganites of alkali-earth elements with similar compositions.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000280050900023	Publication Date	2010-04-01
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0304-3991;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	24	Open Access
Notes	Fwo; Bof; Esteem			Approved	Most recent IF: 2.843; 2010 IF: 2.063
Call Number	UA @ lucian @ c:irua:84085UA @ admin @ c:irua:84085			Serial	721
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Author	Bach, D.; Störmer, H.; Schneider, R.; Gerthsen, D.; Verbeeck, J.
Title	EELS investigations of different niobium oxide phases			Type	A1 Journal article
Year	2006	Publication	Microscopy and microanalysis	Abbreviated Journal	Microsc Microanal
Volume	12	Issue	5	Pages	416-423
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Electron energy loss spectra in conjunction with near-edge fine structures of purely stoichiometric niobium monoxide (NbO) and niobium pentoxide (Nb2O5) reference materials were recorded. The structures of the niobium oxide reference materials were checked by selected area electron diffraction to ensure a proper assignment of the fine structures. NbO and Nb2O5 show clearly different energy loss near-edge fine structures of the Nb-M-4,M-5 and -M-2,M-3 edges and of the O-K edge, reflecting the specific local environments of the ionized atoms. To distinguish the two oxides in a quantitative manner, the intensities under the Nb-M-4,M-5 as well as Nb-M-2,M-3 edges and the O-K edge were measured and their ratios calculated. k-factors were also derived from these measurements.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge, Mass.	Editor
Language		Wos	000241181400007	Publication Date	2006-09-19
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1431-9276;1435-8115;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	1.891	Times cited	50	Open Access
Notes				Approved	Most recent IF: 1.891; 2006 IF: 2.108
Call Number	UA @ lucian @ c:irua:60979UA @ admin @ c:irua:60979			Serial	789
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Author	Bach, D.; Schneider, R.; Gerthsen, D.; Verbeeck, J.; Sigle, W.
Title	EELS of niobium and stoichiometric niobium-oxide phases: part 1: plasmon and Near-edges fine structure			Type	A1 Journal article
Year	2009	Publication	Microscopy and microanalysis	Abbreviated Journal	Microsc Microanal
Volume	15	Issue	6	Pages	505-523
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	A comprehensive electron energy-loss spectroscopy study of niobium (Nb) and stable Nb-oxide phases (NbO, NbO2, Nb2O5) was carried out. In this work (Part I), the plasmons and energy-loss near-edge structures (ELNES) of all relevant Nb edges (Nb-N2,3, Nb-M4,5, Nb-M2,3, Nb-M1, and Nb-L2,3) up to energy losses of about 2600 eV and the O-K edge are analyzed with respect to achieving characteristic fingerprints of Nb in different formal oxidation states (0 for metallic Nb, +2 for NbO, +4 for NbO2, and +5 for Nb2O5). Chemical shifts of the Nb-N2,3, Nb-M4,5, Nb-M2,3, and Nb-L2,3 edges are extracted from the spectra that amount to about 4 eV as the oxidation state increases from 0 for Nb to +5 for Nb2O5. Four different microscopes, including a 200 keV ZEISS Libra with monochromator, were used. The corresponding wide range of experimental parameters with respect to the primary electron energy, convergence, and collection semi-angles as well as energy resolution allows an assessment of the influence of the experimental setup on the ELNES of the different edges. Finally, the intensity of the Nb-L2,3 white-line edges is correlated with niobium 4d-state occupancy in the different reference materials.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge, Mass.	Editor
Language		Wos	000272433200005	Publication Date	2009-10-27
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1431-9276;1435-8115;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	1.891	Times cited	55	Open Access
Notes				Approved	Most recent IF: 1.891; 2009 IF: 3.035
Call Number	UA @ lucian @ c:irua:80320UA @ admin @ c:irua:80320			Serial	790
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