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Author	Shabalovskaya, S.A.; Tian, H.; Anderegg, J.W.; Schryvers, D.U.; Carroll, W.U.; van Humbeeck, J.
Title	The influence of surface oxides on the distribution and release of nickel from Nitinol wires			Type	A1 Journal article
Year	2009	Publication	Biomaterials	Abbreviated Journal	Biomaterials
Volume	30	Issue	4	Pages	468-477
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The patterns of Ni release from Nitinol vary depending on the type of material (NiTi alloys with low or no processing versus commercial wires or sheets). A thick TiO2 layer generated on the wire surface during processing is often considered as a reliable barrier against Ni release. The present study of Nitinol wires with surface oxides resulting from production was conducted to identify the sources of Ni release and its distribution in the surface sublayers. The chemistry and topography of the surfaces of Nitinol wires drawn using different techniques were studied with XPS and SEM. The distribution of Ni into surface depth and the surface oxide thickness were evaluated using Auger spectroscopy, TEM with FIB and ELNES. Ni release was estimated using either ICPA or AAS. Potentiodynamic potential polarization of selected wires was performed in as-received state with no strain and in treated strained samples. Wire samples in the as-received state showed low breakdown potentials (200 mV); the improved corrosion resistance of these wires after treatment was not affected by strain. It is shown how processing techniques affect surface topography, chemistry and also Ni release. Nitinol wires with the thickest surface oxide TiO2 (up to 720 nm) showed the highest Ni release, attributed to the presence of particles of essentially pure Ni whose number and size increased while approaching the interface between the surface and the bulk. The biological implications of high and lasting Ni release are also discussed.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Guildford	Editor
Language		Wos	000262065500006	Publication Date	2008-11-09
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0142-9612;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	8.402	Times cited	102	Open Access
Notes	Fwo; G.0465.05			Approved	Most recent IF: 8.402; 2009 IF: 7.365
Call Number	UA @ lucian @ c:irua:72320			Serial	1641
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Author	Burriel, M.; Casa-Cabanas, M.; Zapata, J.; Tan, H.; Verbeeck, J.; Solis, C.; Roqueta, J.; Skinner, S.J.; Kilner, J.A.; Van Tendeloo, G.; Santiso, J.
Title	Influence of the microstructure on the high-temperature transport properties of GdBaCo₂O_5.5+\delta epitaxial films			Type	A1 Journal article
Year	2010	Publication	Chemistry of materials	Abbreviated Journal	Chem Mater
Volume	22	Issue	19	Pages	5512-5520
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Epitaxial thin films of GdBaCo2O5.5+δ (GBCO) grown by pulsed laser deposition have been studied as a function of deposition conditions. The variation in film structure, domain orientation, and microstructure upon deviations in the cation composition have been correlated with the charge transport properties of the films. The epitaxial GBCO films mainly consist of single- and double-perovskite regions that are oriented in different directions depending on the deposition temperature. Additionally, cobalt depletion induces the formation of a high density of stacking defects in the films, consisting of supplementary GdO planes along the c-axis of the material. The presence of such defects progressively reduces the electrical conductivity. The films closer to the stoichiometric composition have shown p-type electronic conductivity at high pO2 with values as high as 800 S/cm at 330 °C in 1 atm O2, and with a pO2 power dependence with an exponent as low as 1/25, consistent with the behavior reported for bulk GBCO. These values place GBCO thin films as a very promising material to be applied as cathodes in intermediate temperature solid oxide fuel cells.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000282471000013	Publication Date	2010-09-20
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	17	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 9.466; 2010 IF: 6.400
Call Number	UA @ lucian @ c:irua:85412UA @ admin @ c:irua:85412			Serial	1648
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Author	Li, Y.; Tan, H.; Lebedev, O.; Verbeeck, J.; Biermans, E.; Van Tendeloo, G.; Su, B.-L.
Title	Insight into the growth of multiple branched MnOOH nanorods			Type	A1 Journal article
Year	2010	Publication	Crystal growth & design	Abbreviated Journal	Cryst Growth Des
Volume	10	Issue	7	Pages	2969-2976
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Multiple branched manganese oxide hydroxide (MnOOH) nanorods prepared by a hydrothermal process were extensively studied by transmission electron microscopy (TEM). A model of the branch formation is proposed together with a study of the interface structure. The sword-like tip plays a crucial role for the nanorods to form different shapes. Importantly, the branching occurs at an angle of around either 57 degrees or 123 degrees. Specifically, a (111) twin plane can only be formed at the interface with a 123 degrees angle. The interfaces formed with a 57 degrees angle usually contain edge dislocations. Electron energy loss spectroscopy (EELS) demonstrates that the whole crystal has a uniform chemical composition. Interestingly, an epitaxial growth of Mn3O4 at the radial surface was also observed under electron beam irradiation; this is because of the rough purification of the products. The proposed mechanism is expected to shed light on the branched/dendrite nanostructure growth and to provide opportunities for further novel nanomaterial structure growth and design.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000279422700027	Publication Date	2010-06-08
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1528-7483;1528-7505;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	4.055	Times cited	41	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 4.055; 2010 IF: 4.390
Call Number	UA @ lucian @ c:irua:83886UA @ admin @ c:irua:83886			Serial	1672
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Author	Tian, H.; Verbeeck, J.; Brück, S.; Paul, M.; Kufer, D.; Sing, M.; Claessen, R.; Van Tendeloo, G.
Title	Interface-induced modulation of charge and polarization in thin film Fe₃O₄			Type	A1 Journal article
Year	2014	Publication	Advanced materials	Abbreviated Journal	Adv Mater
Volume	26	Issue	3	Pages	461-465
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Charge and polarization modulations in Fe3O4 are controlled by taking advantage of interfacial strain effects. The feasibility of oxidation state control by strain modification is demonstrated and it is shown that this approach offers a stable configuration at room temperature. Direct evidence of how a local strain field changes the atomic coordination and introduces atomic displacements leading to polarization of Fe ions is presented.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000334289300011	Publication Date	2013-10-25
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0935-9648;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	19.791	Times cited	15	Open Access
Notes	Vortex; FWO; Countatoms; Hercules ECASJO_;			Approved	Most recent IF: 19.791; 2014 IF: 17.493
Call Number	UA @ lucian @ c:irua:112419UA @ admin @ c:irua:112419			Serial	1694
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Author	Van Rompaey, S.; Dachraoui, W.; Turner, S.; Podyacheva, O.Y.; Tan, H.; Verbeeck, J.; Abakumov, A.; Hadermann, J.
Title	Layered oxygen vacancy ordering in Nb-doped SrCo_1-xFe_xO_3-\delta perovskite			Type	A1 Journal article
Year	2013	Publication	Zeitschrift für Kristallographie	Abbreviated Journal	Z Krist-Cryst Mater
Volume	228	Issue	1	Pages	28-34
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The crystal structure of SrCo0.7Fe0.2Nb0.1O2.72 was determined using a combination of precession electron diffraction (PED), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM) and spatially resolved electron energy loss spectroscopy (STEM-EELS). The structure has a tetragonal P4/mmm symmetry with cell parameters a = b = a(p), c = 2a(p) (a(p) being the cell parameter of the perovskite parent structure). Octahedral BO2 layers alternate with the anion-deficient BO1.4 layers, the different B cations are randomly distributed over both layers. The specific feature of the SrCo0.7Fe0.2NB0.1O2.72 microstructure is a presence of extensive nanoscale twinning resulting in domains with alignment of the tetragonal c-axis along all three cubic direction of the perovskite subcell.
Address
Corporate Author				Thesis
Publisher		Place of Publication	München	Editor
Language		Wos	000315475900004	Publication Date	2013-01-24
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	2194-4946;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.179	Times cited	9	Open Access
Notes	Fwo; Countatoms			Approved	Most recent IF: 3.179; 2013 IF: NA
Call Number	UA @ lucian @ c:irua:107698UA @ admin @ c:irua:107698			Serial	1808
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Author	Meledina, M.; Turner, S.; Galvita, V.V.; Poelman, H.; Marin, G.B.; Van Tendeloo, G.
Title	Local environment of Fe dopants in nanoscale Fe : CeO_2-x oxygen storage material			Type	A1 Journal article
Year	2015	Publication	Nanoscale	Abbreviated Journal	Nanoscale
Volume	7	Issue	7	Pages	3196-3204
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Nanoscale Fe : CeO2-x oxygen storage material for the process of chemical looping has been investigated by advanced transmission electron microscopy and electron energy-loss spectroscopy before and after a model looping procedure, consisting of redox cycles at heightened temperature. Separately, the activity of the nanomaterial has been tested in a toluene total oxidation reaction. The results show that the material consists of ceria nanoparticles, doped with single Fe atoms and small FeOx clusters. The iron ion is partially present as Fe3+ in a solid solution within the ceria lattice. Furthermore, enrichment of reduced Fe2+ species is observed in nanovoids present in the ceria nanoparticles, as well as at the ceria surface. After chemical looping, agglomeration occurs and reduced nanoclusters appear at ceria grain boundaries formed by sintering. These clusters originate from surface Fe2+ aggregation, and from bulk Fe3+, which “leaks out” in reduced state after cycling to a slightly more agglomerated form. The activity of Fe : CeO2 during the toluene total oxidation part of the chemical looping cycle is ensured by the dopant Fe in the Fe1-xCexO2 solid solution, and by surface Fe species. These measurements on a model Fe : CeO2-x oxygen storage material give a unique insight into the behavior of dopants within a nanosized ceria host, and allow to interpret a plethora of (doped) cerium oxide-based reactions.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge	Editor
Language		Wos	000349473200046	Publication Date	2015-01-13
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	17	Open Access
Notes				Approved	Most recent IF: 7.367; 2015 IF: 7.394
Call Number	c:irua:125299			Serial	1828
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Author	Brück, S.; Paul, M.; Tian, H.; Müller, A.; Kufer, D.; Praetorius, C.; Fauth, K.; Audehm, P.; Goering, E.; Verbeeck, J.; Van Tendeloo, G.; Sing, M.; Claessen, R.;
Title	Magnetic and electronic properties of the interface between half metallic Fe₃O₄ and semiconducting ZnO			Type	A1 Journal article
Year	2012	Publication	Applied physics letters	Abbreviated Journal	Appl Phys Lett
Volume	100	Issue	8	Pages	081603-081603,4
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We have investigated the magnetic depth profile of an epitaxial Fe3O4 thin film grown directly on a semiconducting ZnO substrate by soft x-ray resonant magnetic reflectometry (XRMR) and electron energy loss spectroscopy (EELS). Consistent chemical profiles at the interface between ZnO and Fe3O4 are found from both methods. Valence selective EELS and XRMR reveal independently that the first monolayer of Fe at the interface between ZnO and Fe3O4 contains only Fe3+ ions. Besides this narrow 2.5 Å interface layer, Fe3O4 shows magnetic bulk properties throughout the whole film making highly efficient spin injection in this system feasible.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000300711200014	Publication Date	2012-02-22
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-6951;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.411	Times cited	12	Open Access
Notes	The authors thank E. Pellegrin for helpful comments and S. Macke for help with the software REMAGX. S.B. acknowledges financial support by the HZB, Berlin, and the Australian Government via Grant No. RM08550. H.T. acknowledges funding from GOA project “XANES meets ELNES,” J.V. and G.V.T. acknowledge funding from the European Research Council under Grant No. 46791-COUN-TATOMS. The authors acknowledge financial support by the DFG through Forschergruppe FOR 1162.			Approved	Most recent IF: 3.411; 2012 IF: 3.794
Call Number	UA @ lucian @ c:irua:95041UA @ admin @ c:irua:95041			Serial	1860
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Author	Maignan, A.; Singh, K.; Simon, C.; Lebedev, O.I.; Martin, C.; Tan, H.; Verbeeck, J.; Van Tendeloo, G.
Title	Magnetic and magnetodielectric properties of erbium iron garnet ceramic			Type	A1 Journal article
Year	2013	Publication	Journal of applied physics	Abbreviated Journal	J Appl Phys
Volume	113	Issue	3	Pages	033905-5
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	An Er3Fe5O12 ceramic has been sintered in oxygen atmosphere at 1400 °C for dielectric measurements. Its structural quality at room temperature has been checked by combining transmission electron microscopy and X-ray diffraction. It crystallizes in the cubic space group Ia3d with a = 12.3488(1). The dielectric permittivity ([variantgreekepsilon]′) and losses (tan δ) measurements as a function of temperature reveal the existence of two anomalies, a broad one between 110 K and 80 K, attributed to the Er3+ spin reorientation, and a second sharper feature at about 45 K associated to the appearance of irreversibility on the magnetic susceptibility curves. In contrast to the lack of magnetic field impact on [variantgreekepsilon]′ for the former anomaly, a complex magnetic field effect has been evidenced below 45 K. The isothermal [variantgreekepsilon]′(H) curves show the existence of positive magnetodielectric effect, reaching a maximum of 0.14% at 3 T and 10 K. Its magnitude decreases as H is further increased. Interestingly, for the lowest H values, a linear regime in the [variantgreekepsilon]′(H) curve is observed. From this experimental study, it is concluded that the [variantgreekepsilon]′ anomaly, starting above the compensation temperature Tc (75 K) and driven by the internal magnetic field, is not sensitive to an applied external magnetic field. Thus, below 45 K, it is the magnetic structure which is responsible for the coupling between spin and charge in this iron garnet.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000313670600042	Publication Date	2013-01-16
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0021-8979;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.068	Times cited	15	Open Access
Notes	Vortex; Countatoms ECASJO_;			Approved	Most recent IF: 2.068; 2013 IF: 2.185
Call Number	UA @ lucian @ c:irua:106182UA @ admin @ c:irua:106182			Serial	1861
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Author	Boullay, P.; David, A.; Sheets, W.C.; Lüders, U.; Prellier, W.; Tan, H.; Verbeeck, J.; Van Tendeloo, G.; Gatel, C.; Vincze, G.; Radi, Z.
Title	Microstructure and interface studies of LaVO₃/SrVO₃ superlattices			Type	A1 Journal article
Year	2011	Publication	Physical review : B : condensed matter and materials physics	Abbreviated Journal	Phys Rev B
Volume	83	Issue	12	Pages	125403-125403,6
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The structure and interface characteristics of (LaVO3)6m(SrVO3)m superlattices deposited on a (100)-SrTiO3 substrate were studied using transmission electron microscopy (TEM). Cross-section TEM studies revealed that both LaVO3 (LVO) and SrVO3 (SVO) layers are good single-crystal quality and epitaxially grown with respect to the substrate. It is evidenced that LVO layers are made of two orientational variants of a distorted perovskite compatible with bulk LaVO3, while SVO layers suffers from a tetragonal distortion due to the substrate-induced stain. Electron energy loss spectroscopy investigations indicate changes in the fine structure of the V L23 edge, related to a valence change between the LaVO3 and the SrVO3 layers.
Address
Corporate Author				Thesis
Publisher		Place of Publication		Editor
Language		Wos	000288160300006	Publication Date	2011-03-09
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1098-0121;1550-235X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.836	Times cited	26	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 3.836; 2011 IF: 3.691
Call Number	UA @ lucian @ c:irua:88648UA @ admin @ c:irua:88648			Serial	2054
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Author	He, Z.; Tian, H.; Deng, G.; Xu, Q.; Van Tendeloo, G.
Title	Microstructure of bilayer manganite PrCa₂Mn₂O₇ showing charge/orbital ordering			Type	A1 Journal article
Year	2013	Publication	Applied physics letters	Abbreviated Journal	Appl Phys Lett
Volume	102	Issue	21	Pages	212902-212905
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The microstructure of the charge/orbital ordering Ruddleden-Popper phase PrCa2Mn2O7 was studied by transmission electron microscopy along both the [001] and the [110] orientation. Three coexisting charge/orbital ordering phases CO1, CO2, and CO3 were observed along the [001] orientation at room temperature. Different from the one-dimensional modulation in the CO1 and CO2 phase, the CO3 phase is characterized by two sets of mutually perpendicular structural modulations. From [110] high angle annular dark field-scanning transmission electron microscopy, we found that the Pr atoms locate in-between the bilayer MnO6 octahedra, which is different from the previous reports.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000320620400056	Publication Date	2013-05-29
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-6951;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.411	Times cited	4	Open Access
Notes	Countatoms			Approved	Most recent IF: 3.411; 2013 IF: 3.515
Call Number	UA @ lucian @ c:irua:108762			Serial	2068
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Author	Tian, H.; Schryvers, D.; Shabalovskaya, S.; van Humbeeck, J.
Title	Microstructure of surface and subsurface layers of a Ni-Ti shape memory microwire			Type	A1 Journal article
Year	2009	Publication	Microscopy and microanalysis	Abbreviated Journal	Microsc Microanal
Volume	15	Issue		Pages	62-70
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The microstructure of a 55 Êm diameter, cold-worked Ni-Ti microwire is investigated by different transmission electron microscopy techniques. The surface consists of a few hundred nanometer thick oxide layer composed of TiO and TiO2 with a small fraction of inhomogeneously distributed Ni. The interior of the wire has a core-shell structure with primarily B2 grains in the 1 Êm thick shell, and heavily twinned B19 martensite in the core. This core-shell structure can be explained by a concentration gradient of the alloying elements resulting in a structure separation due to the strong temperature dependence of the martensitic start temperature. Moreover, in between the B2 part of the metallic core-shell and the oxide layer, a Ni3Ti interfacial layer is detected.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge, Mass.	Editor
Language		Wos	000262912700009	Publication Date	2009-01-15
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	15	Open Access
Notes	FWO G.0465.05; Multimat			Approved	Most recent IF: 1.891; 2009 IF: 3.035
Call Number	UA @ lucian @ c:irua:72319			Serial	2074
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Author	Chen, L.-H.; Li, X.-Y.; Tian, G.; Li, Y.; Tan, H.-Y.; Van Tendeloo, G.; Zhu, G.-S.; Qiu, S.-L.; Yang, X.-Y.; Su, B.-L.
Title	Multimodal zeolite-beta-based catalysts with a hierarchical, three-level pore structure			Type	A1 Journal article
Year	2011	Publication	Chemsuschem	Abbreviated Journal	Chemsuschem
Volume	4	Issue	10	Pages	1452-1456
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Hole diggers: The hierarchically structured porous solid-acid catalyst described in this report possess a remarkable pore system, encompassing well-defined macrochannels, interconnected mesopores, intracrystalline mesopores, and tunable zeolite micropores. Importantly, the catalyst exhibits very strong acidity and superior catalytic activity for esterification reactions.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000296497400009	Publication Date	2011-08-16
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1864-5631;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	7.226	Times cited	33	Open Access
Notes	Iap			Approved	Most recent IF: 7.226; 2011 IF: 6.827
Call Number	UA @ lucian @ c:irua:93675			Serial	2223
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Author	Tian, H.; Schryvers, D.; Claeys, P.
Title	Nanodiamonds do not provide unique evidence for a Younger Dryas impact			Type	A1 Journal article
Year	2011	Publication	Proceedings of the National Academy of Sciences of the United States of America	Abbreviated Journal	P Natl Acad Sci Usa
Volume	108	Issue	1	Pages	40-44
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Microstructural, δ13C isotope and C/N ratio investigations were conducted on excavated material from the black Younger Dryas boundary in Lommel, Belgium, aiming for a characterisation of the carbon content and structures. Cubic diamond nanoparticles are found in large numbers. The larger ones with diameters around or above 10 nm often exhibit single or multiple twins. The smaller ones around 5 nm in diameter are mostly defect-free. Also larger flake-like particles, around 100 nm in lateral dimension, with a cubic diamond structure are observed as well as large carbon onion structures. The combination of these characteristics does not yield unique evidence for an exogenic impact related to the investigated layer.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000285915000012	Publication Date	2010-12-21
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0027-8424;1091-6490;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	9.661	Times cited	32	Open Access
Notes				Approved	Most recent IF: 9.661; 2011 IF: 9.681
Call Number	UA @ lucian @ c:irua:88733			Serial	2254
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Author	Hadermann, J.; Abakumov, A.M.; Perkisas, T.; d' Hondt, H.; Tan, H.; Verbeeck, J.; Filonenko, V.P.; Antipov, E.V.; Van Tendeloo, G.
Title	New perovskite-based manganite Pb₂Mn₂O₅			Type	A1 Journal article
Year	2010	Publication	Journal of solid state chemistry	Abbreviated Journal	J Solid State Chem
Volume	183	Issue	183	Pages	2190-2195
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	A new perovskite based compound Pb2Mn2O5 has been synthesized using a high pressure high temperature technique. The structure model of Pb2Mn2O5 is proposed based on electron diffraction, high angle annular dark field scanning transmission electron microscopy and high resolution transmission electron microscopy. The compound crystallizes in an orthorhombic unit cell with parameters a=5.736(1)Å≈√2a p p p (a p the parameter of the perovskite subcell) and space group Pnma. The Pb2Mn2O5 structure consists of quasi two-dimensional perovskite blocks separated by 1/2[110] p (1̄01) p crystallographic shear planes. The blocks are connected to each other by chains of edge-sharing MnO5 distorted tetragonal pyramids. The chains of MnO5 pyramids and the MnO6 octahedra of the perovskite blocks delimit six-sided tunnels accommodating double chains of Pb atoms. The tunnels and pyramidal chains adopt two mirror-related configurations (left L and right R) and layers consisting of chains and tunnels of the same configuration alternate in the structure according to an -LRLR-sequence. The sequence is sometimes locally violated by the appearance of -LL- or -RR-fragments. A scheme is proposed with a JahnTeller distortion of the MnO6 octahedra with two long and two short bonds lying in the ac plane, along two perpendicular orientations within this plane, forming a d-type pattern.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000282139600041	Publication Date	2010-07-25
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0022-4596;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.299	Times cited	8	Open Access
Notes	Fwo; Bof; Esteem 026019			Approved	Most recent IF: 2.299; 2010 IF: 2.261
Call Number	UA @ lucian @ c:irua:85472UA @ admin @ c:irua:85472			Serial	2332
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Author	Filippousi, M.; Papadimitriou, S.A.; Bikiaris, D.N.; Pavlidou, E.; Angelakeris, M.; Zamboulis, D.; Tian, H.; Van Tendeloo, G.
Title	Novel coreshell magnetic nanoparticles for Taxol encapsulation in biodegradable and biocompatible block copolymers : preparation, characterization and release properties			Type	A1 Journal article
Year	2013	Publication	International journal of pharmaceutics	Abbreviated Journal	Int J Pharmaceut
Volume	448	Issue	1	Pages	221-230
Keywords	A1 Journal article; Pharmacology. Therapy; Electron microscopy for materials research (EMAT)
Abstract	Theranostic polymeric nanocarriers loaded with anticancer drug Taxol and superparamagnetic iron oxide nanocrystals have been developed for possible magnetic resonance imaging (MRI) use and cancer therapy. Multifunctional nanocarriers with a coreshell structure have been prepared by coating superparamagnetic Fe3O4 nanoparticles with block copolymer of poly(ethylene glycol)-b-poly(propylene succinate) with variable molecular weights of the hydrophobic block poly(prolylene succinate). The multifunctional polymer nano-vehicles were prepared using a nanoprecipitation method. Scanning transmission electron microscopy revealed the encapsulation of magnetic nanoparticles inside the polymeric matrix. Energy dispersive X-ray spectroscopy and electron energy loss spectroscopy mapping allowed us to determine the presence of the different material ingredients in a quantitative way. The diameter of the nanoparticles is below 250 nm yielding satisfactory encapsulation efficiency. The nanoparticles exhibit a biphasic drug release pattern in vitro over 15 days depending on the molecular weight of the hydrophobic part of the polymer matrix. These new systems where anti-cancer therapeutics like Taxol and iron oxide nanoparticles (IOs) are co-encapsulated into new facile polymeric nanoparticles, could be addressed as potential multifunctional vehicles for simultaneous drug delivery and targeting imaging as well as real time monitoring of therapeutic effects.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000319052000026	Publication Date	2013-03-21
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0378-5173;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.649	Times cited	29	Open Access
Notes	Countatoms			Approved	Most recent IF: 3.649; 2013 IF: 3.785
Call Number	UA @ lucian @ c:irua:107348			Serial	2374
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Author	Yin, S.; Tian, H.; Ren, Z.; Wei, X.; Chao, C.; Pei, J.; Li, X.; Xu, G.; Shen, G.; Han, G.
Title	Octahedral-shaped perovskite nanocrystals and their visible-light photocatalytic activity			Type	A1 Journal article
Year	2014	Publication	Chemical communications	Abbreviated Journal	Chem Commun
Volume	50	Issue	45	Pages	6027-6030
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Octahedral-shaped perovskite PbTiO3 nanocrystals (PT OCT) with well-defined {111} facets exposed have been successfully synthesized via a facile hydrothermal method by using LiNO3 as an ion surfactant. The Li-O bond on the surface of PT OCT nanocrystals is essential to the stability of such nanocrystals and also results in a dramatic high visible-light photocatalytic activity.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000335984700022	Publication Date	2014-04-15
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1359-7345;1364-548X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.319	Times cited	19	Open Access
Notes				Approved	Most recent IF: 6.319; 2014 IF: 6.834
Call Number	UA @ lucian @ c:irua:117690			Serial	2428
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Author	Abakumov, A.M.; Hadermann, J.; Tsirlin, A.A.; Tan, H.; Verbeeck, J.; Zhang, H.; Dikarev, E.V.; Shpanchenko, R.V.; Antipov, E.V.
Title	Original close-packed structure and magnetic properties of the Pb₄Mn₉O₂₀ manganite			Type	A1 Journal article
Year	2009	Publication	Journal of solid state chemistry	Abbreviated Journal	J Solid State Chem
Volume	182	Issue	8	Pages	2231-2238
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The crystal structure of the Pb4Mn9O20 compound (previously known as Pb0.43MnO2.18) was solved from powder X-ray diffraction, electron diffraction, and high resolution electron microscopy data (S.G. Pnma, a=13.8888(2) Å, b=11.2665(2) Å, c=9.9867(1) Å, RI=0.016, RP=0.047). The structure is based on a 6H (cch)2 close packing of pure oxygen h-type (O16) layers alternating with mixed c-type (Pb4O12) layers. The Mn atoms occupy octahedral interstices formed by the oxygen atoms of the close-packed layers. The MnO6 octahedra share edges within the layers, whereas the octahedra in neighboring layers are linked through corner sharing. The relationship with the closely related Pb3Mn7O15 structure is discussed. Magnetization measurements reveal a peculiar magnetic behavior with a phase transition at 52 K, a small net magnetization below the transition temperature, and a tendency towards spin freezing.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000269066400035	Publication Date	2009-06-12
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0022-4596;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.299	Times cited	5	Open Access
Notes	The authors are grateful to Christoph Geibel for the help in magnetization measurements. A.Ts. acknowledges MPI CKS for hospitality and financial support during the stay. E.D. thanks the National Science Foundation (CHE-0718900) for financial support. This work was supported by the Russian Foundation of Basic Research (RFBR Grants 07-03-00664-a, 06-03-90168-a and 07-03-00890-a). The authors acknowledge financial support from the European Union under the Framework 6 program under a contract for an Integrated Infrastructure Initiative. Reference 026019 ESTEEM.			Approved	Most recent IF: 2.299; 2009 IF: 2.340
Call Number	UA @ lucian @ c:irua:78935UA @ admin @ c:irua:78935			Serial	2529
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Author	Tan, H.; Verbeeck, J.; Abakumov, A.; Van Tendeloo, G.
Title	Oxidation state and chemical shift investigation in transition metal oxides by EELS			Type	A1 Journal article
Year	2012	Publication	Ultramicroscopy	Abbreviated Journal	Ultramicroscopy
Volume	116	Issue		Pages	24-33
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Transition metal L2,3 electron energy-loss spectra for a wide range of V-, Mn- and Fe-based oxides were recorded and carefully analyzed for their correlation with the formal oxidation states of the transition metal ions. Special attention is paid to obtain an accurate energy scale which provides absolute energy positions for all core-loss edges. The white-line ratio method, chemical shift method, ELNES fitting method, two-parameter method and other methods are compared and their validity is discussed. Both the ELNES fitting method and the chemical shift method have the advantage of a wide application range and good consistency but require special attention to accurately measure the core-loss edge position. The obtained conclusions are of fundamental importance, e.g., for obtaining atomic resolution oxidation state information in modern experiments.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Amsterdam	Editor
Language		Wos	000304473700004	Publication Date	2012-03-10
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	413	Open Access
Notes	Fwo			Approved	Most recent IF: 2.843; 2012 IF: 2.470
Call Number	UA @ lucian @ c:irua:96959UA @ admin @ c:irua:96959			Serial	2541
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Author	Verbeeck, J.; Tian, H.; Schattschneider, P.
Title	Production and application of electron vortex beams			Type	A1 Journal article
Year	2010	Publication	Nature	Abbreviated Journal	Nature
Volume	467	Issue	7313	Pages	301-304
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Vortex beams (also known as beams with a phase singularity) consist of spiralling wavefronts that give rise to angular momentum around the propagation direction. Vortex photon beams are widely used in applications such as optical tweezers to manipulate micrometre-sized particles and in micro-motors to provide angular momentum1, 2, improving channel capacity in optical3 and radio-wave4 information transfer, astrophysics5 and so on6. Very recently, an experimental realization of vortex beams formed of electrons was demonstrated7. Here we describe the creation of vortex electron beams, making use of a versatile holographic reconstruction technique in a transmission electron microscope. This technique is a reproducible method of creating vortex electron beams in a conventional electron microscope. We demonstrate how they may be used in electron energy-loss spectroscopy to detect the magnetic state of materials and describe their properties. Our results show that electron vortex beams hold promise for new applications, in particular for analysing and manipulating nanomaterials, and can be easily produced.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000281824900033	Publication Date	2010-09-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0028-0836;1476-4687;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	40.137	Times cited	626	Open Access
Notes	Esteem 026019; Fwo			Approved	Most recent IF: 40.137; 2010 IF: 36.104
Call Number	UA @ lucian @ c:irua:84878UA @ admin @ c:irua:84878			Serial	2720
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Author	Philippaerts, A.; Paulussen, S.; Turner, S.; Lebedev, O.I.; Van Tendeloo, G.; Poelman, H.; Bulut, M.; de Clippel, F.; Smeets, P.; Sels, B.; Jacobs, P.
Title	Selectivity in sorption and hydrogenation of methyl oleate and elaidate on MFI zeolites			Type	A1 Journal article
Year	2010	Publication	Journal of catalysis	Abbreviated Journal	J Catal
Volume	270	Issue	1	Pages	172-184
Keywords	A1 Journal article; Engineering sciences. Technology; Electron microscopy for materials research (EMAT)
Abstract	Different zeolites were tested for selective removal of methyl elaidate (trans isomer) from an equimolar mixture with methyl oleate (cis isomer). Sorption experiments of the geometric isomers show that only ZSM-5 samples with reduced Al content in the framework are able to discriminate among the bent cis and the linear trans fatty acid methyl esters. Hydrogenation experiments of equimolar methyl oleate and elaidate mixtures at low temperature (65 °C) and high hydrogen pressure (6.0 MPa), using Pt catalysts, confirm this result. Only with a Pt/NaZSM-5 catalyst outspoken selectivity for the hydrogenation of the trans isomer is obtained. In order to prepare a selective Pt/ZSM-5 catalyst, the influence of Pt addition (impregnation, ion-exchange and competitive ion-exchange) and Pt activation (different calcination and reduction temperatures) on the Pt-distribution and Pt particle size was investigated using SEM, bright-field and HR TEM, EDX, electron tomography, CO-chemisorption, XPS, XRD, and UVvis measurements. The best result in terms of hydrogenation activity and selectivity is obtained with a Pt/ZSM-5 catalyst, which is prepared via competitive ion-exchange, followed by slow calcination up to 350 °C under high O2 flow and a reduction up to 500 °C under H2. This preparation method leads to a Pt/ZSM-5 catalyst with the best Pt distribution and the smallest Pt clusters occluded in the zeolite structure. Finally, the influence of zeolite crystal size, morphology, and elemental composition of ZSM-5 on hydrogenation activity and selectivity was investigated in detail.
Address
Corporate Author				Thesis
Publisher		Place of Publication	San Diego, Calif.	Editor
Language		Wos	000275966100021	Publication Date	2010-01-28
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0021-9517;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.844	Times cited	24	Open Access
Notes	FWO; IAP-IV; Methusalem			Approved	Most recent IF: 6.844; 2010 IF: 5.415
Call Number	UA @ lucian @ c:irua:82435			Serial	2970
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Author	Verbeeck, J.; Guzzinati, G.; Clark, L.; Juchtmans, R.; Van Boxem, R.; Tian, H.; Béché, A.; Lubk, A.; Van Tendeloo, G.
Title	Shaping electron beams for the generation of innovative measurements in the (S)TEM			Type	A1 Journal article
Year	2014	Publication	Comptes rendus : physique	Abbreviated Journal	Cr Phys
Volume	15	Issue	2-3	Pages	190-199
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	In TEM, a typical goal consists of making a small electron probe in the sample plane in order to obtain high spatial resolution in scanning transmission electron microscopy. In order to do so, the phase of the electron wave is corrected to resemble a spherical wave compensating for aberrations in the magnetic lenses. In this contribution, we discuss the advantage of changing the phase of an electron wave in a specific way in order to obtain fundamentally different electron probes opening up new applications in the (S)TEM. We focus on electron vortex states as a specific family of waves with an azimuthal phase signature and discuss their properties, production and applications. The concepts presented here are rather general and also different classes of probes can be obtained in a similar fashion, showing that electron probes can be tuned to optimize a specific measurement or interaction.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Paris	Editor
Language		Wos	000334013600009	Publication Date	2014-02-01
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1631-0705;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.048	Times cited	22	Open Access
Notes	Vortex ECASJO_;			Approved	Most recent IF: 2.048; 2014 IF: 2.035
Call Number	UA @ lucian @ c:irua:116946UA @ admin @ c:irua:116946			Serial	2992
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Author	Hermans, I.; Breynaert, E.; Poelman, H.; de Gryse, R.; Liang, D.; Van Tendeloo, G.; Maes, A.; Peeters, J.; Jacobs, P.
Title	Silica-supported chromium oxide: colloids as building blocks			Type	A1 Journal article
Year	2007	Publication	Physical chemistry, chemical physics	Abbreviated Journal	Phys Chem Chem Phys
Volume	9	Issue	39	Pages	5382-5386
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract
Address
Corporate Author				Thesis
Publisher		Place of Publication	Cambridge	Editor
Language		Wos	000249925500022	Publication Date	2007-10-03
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1463-9076;1463-9084;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	4.123	Times cited	8	Open Access
Notes				Approved	Most recent IF: 4.123; 2007 IF: 3.343
Call Number	UA @ lucian @ c:irua:66752			Serial	3000
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Author	Tian, H.; Schryvers, D.; Liu, D.; Jiang, Q.; van Humbeeck, J.
Title	Stability of Ni in nitinol oxide surfaces			Type	A1 Journal article
Year	2011	Publication	Acta biomaterialia	Abbreviated Journal	Acta Biomater
Volume	7	Issue	2	Pages	892-899
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The stability of Ni in titanium oxide surface layers on nitinol wires known to release certain amounts of Ni was investigated by first principles density functional theory and transmission electron microscopy. The oxides were identified as a combination of TiO and TiO2 depending on the thickness of the layer. The calculations indicate that free Ni atoms can exist in TiO at ambient temperature while Ni particles form in TiO2, which was confirmed by the transmission electron microscopy observations. The results are discussed with respect to surface stability and Ni release due to free Ni atoms and Ni particles.
Address
Corporate Author				Thesis
Publisher		Place of Publication	S.l.	Editor
Language		Wos	000286707700047	Publication Date	2010-09-17
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1742-7061;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	6.319	Times cited	39	Open Access
Notes	Fwo			Approved	Most recent IF: 6.319; 2011 IF: 4.865
Call Number	UA @ lucian @ c:irua:85998			Serial	3128
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Author	Vanhumbeeck, J.-F.; Tian, H.; Schryvers, D.; Proost, J.
Title	Stress-assisted crystallisation in anodic titania			Type	A1 Journal article
Year	2011	Publication	Corrosion science	Abbreviated Journal	Corros Sci
Volume	53	Issue	4	Pages	1269-1277
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	The relationship between the microstructural and internal stress evolution during Ti anodising is discussed. Samples anodised galvanostatically to 12 V and 40 V, corresponding to different stages of the internal stress evolution, were examined by in-plane and cross-section transmission electron microscopy. Electron diffraction patterns have been complemented with stoichiometry data obtained from energy loss near edge structure spectra. The sample anodised to 40 V was observed to consist of two regions, with a crystallised inner region adjacent to the metal/oxide interface. Crystallisation of this region is associated with the presence of large compressive internal stresses which build up during anodising up to 12 V.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Oxford	Editor
Language		Wos	000288972000016	Publication Date	2010-12-31
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0010-938X;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	5.245	Times cited	11	Open Access
Notes	Fwo			Approved	Most recent IF: 5.245; 2011 IF: 3.734
Call Number	UA @ lucian @ c:irua:88385			Serial	3177
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Author	Tan, H.; Lebedev, O.I.; McLaughlin, A.C.; Van Tendeloo, G.
Title	The superstructure and superconductivity of Ru1222 based RuSr₂Gd_2-x-yY_yCe_xCu₂O_10-\delta compounds			Type	A1 Journal article
Year	2010	Publication	Superconductor science and technology	Abbreviated Journal	Supercond Sci Tech
Volume	23	Issue	11	Pages	115013-115013,8
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	For the first time, the local structure and physical properties of Ru1222 based compounds (RuSr(2)Gd(1.4)Ce(0.6)Cu(2)O(10-delta) and RuSr(2)Gd(1.8-x)Y(0.2)CexCu(2)O(10) (x = 0.90-0.55)) have been investigated and analyzed together on the very same compounds. The Ru1222 superstructure was confirmed by TEM at a local scale and was suggested to have an orthorhombic symmetry with space group Aba2 and lattice parameters a(s) similar or equal to root 2a, b(s) similar or equal to root 2a and c(s) = c. This new Ru1222 superstructure distortion from tetragonal symmetry is proposed to have a positive correlation with the superconductivity variation of these compounds. The more the distortion towards orthorhombic symmetry, the higher the critical superconducting temperature these compounds can achieve. The T(c)(0) of RuSr(2)Gd(1.8-x)Y(0.2)Ce(x)Cu(2)O(10-delta) (x = 0.85-0.55) increases monotonically from 4 to 16 K when x decreases from 0.85 to 0.70, then RuSr(2)Gd(2)Cu(2)O(8) defects emerge and the T(c) decreases with decreasing x. Ru1212 defects are observed to intergrow epitaxially with the Ru1222 structure as lamellas along the c-axis in RuSr(2)Gd(1.4)Ce(0.6)Cu(2)O(10-delta). Although Ru1212 is a superconductor, the intergrowth severely restrains its superconductivity.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Bristol	Editor
Language		Wos	000284308000013	Publication Date	2010-10-09
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	1	Open Access
Notes	Fwo; Esteem 026019			Approved	Most recent IF: 2.878; 2010 IF: 2.402
Call Number	UA @ lucian @ c:irua:95553			Serial	3385
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Author	d' Hondt, H.; Hadermann, J.; Abakumov, A.M.; Kalyuzhnaya, A.S.; Rozova, M.G.; Tsirlin, A.A.; Tan, H.; Verbeeck, J.; Antipov, E.V.; Van Tendeloo, G.
Title	Synthesis, crystal structure and magnetic properties of the Sr₂Al_0.78Mn_1.22O_5.2 anion-deficient layered perovskite			Type	A1 Journal article
Year	2009	Publication	Journal of solid state chemistry	Abbreviated Journal	J Solid State Chem
Volume	182	Issue	2	Pages	356-363
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	A new layered perovskite Sr2Al0.78Mn1.22O5.2 has been synthesized by solid state reaction in a sealed evacuated silica tube. The crystal structure has been determined using electron diffraction, high-resolution electron microscopy, and high-angle annular dark field imaging and refined from X-ray powder diffraction data (space group P4/mmm, a=3.89023(5) Å, c=7.8034(1) Å, RI=0.023, RP=0.015). The structure is characterized by an alternation of MnO2 and (Al0.78Mn0.22)O1.2 layers. Oxygen atoms and vacancies, as well as the Al and Mn atoms in the (Al0.78Mn0.22)O1.2 layers are disordered. The local atomic arrangement in these layers is suggested to consist of short fragments of brownmillerite-type tetrahedral chains of corner-sharing AlO4 tetrahedra interrupted by MnO6 octahedra, at which the chain fragments rotate over 90°. This results in an averaged tetragonal symmetry. This is confirmed by the valence state of Mn measured by EELS. The relationship between the Sr2Al0.78Mn1.22O5.2 tetragonal perovskite and the parent Sr2Al1.07Mn0.93O5 brownmillerite is discussed. Magnetic susceptibility measurements indicate spin glass behavior of Sr2Al0.78Mn1.22O5.2. The lack of long-range magnetic ordering contrasts with Mn-containing brownmillerites and is likely caused by the frustration of interlayer interactions due to presence of the Mn atoms in the (Al0.78Mn0.22)O1.2 layers.
Address
Corporate Author				Thesis
Publisher		Place of Publication	London	Editor
Language		Wos	000263124700022	Publication Date	2008-11-14
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0022-4596;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.299	Times cited	12	Open Access
Notes	Iap Vi			Approved	Most recent IF: 2.299; 2009 IF: 2.340
Call Number	UA @ lucian @ c:irua:72943			Serial	3450
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Author	Tian, H.; Schryvers, D.; Shabalovskaya, S.; van Humbeeck, J.
Title	TEM study of the mechanism of Ni ion release from Nitinol wires with original oxides			Type	P1 Proceeding
Year	2009	Publication		Abbreviated Journal
Volume		Issue		Pages	05027,1-05027,6
Keywords	P1 Proceeding; Electron microscopy for materials research (EMAT)
Abstract	The surface of commercial Nitinol wires with original oxides and a thickness in the 30-190 nm range was investigated by different state of art TEM techniques. The oxide surface layer was identified as a combination of TiO and TiO2 depending on the processing of the wire. Between the core of the wires and the oxidized surface, an interfacial Ni3Ti nanolayer was observed while Ni nanoparticles are found inside the original oxide. The particle sizes, their distribution in the surface and the Ti-O stoichiometry were deduced from the analysis of the obtained data. Molecular dynamics calculations performed for evaluation of the stability of Ni particles relative to the atomic state revealed that a pure Ni particle has a lower energy than free Ni atoms inside the TiO2 lattice. The obtained results are discussed with respect to surface stability and Ni release in the human body.
Address
Corporate Author				Thesis
Publisher	Edp	Place of Publication	Coutaboeuf	Editor
Language		Wos	000274582300092	Publication Date	2009-08-31
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN		ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor		Times cited	1	Open Access
Notes				Approved	Most recent IF: NA
Call Number	UA @ lucian @ c:irua:81954			Serial	3493
Permanent link to this record



Author	Paul, M.; Kufer, D.; Müller, A.; Brück, S.; Goering, E.; Kamp, M.; Verbeeck, J.; Tian, H.; Van Tendeloo, G.; Ingle, N.J.C.; Sing, M.; Claessen, R.
Title	Fe₃O₄/ZnO : a high-quality magnetic oxide-semiconductor heterostructure by reactive deposition			Type	A1 Journal article
Year	2011	Publication	Applied physics letters	Abbreviated Journal	Appl Phys Lett
Volume	98	Issue	1	Pages	012512,1-012512,3
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	We demonstrate the epitaxial growth of Fe<sub>3</sub>O<sub>4</sub> films on ZnO by a simple reactive deposition procedure using molecular oxygen as an oxidizing agent. X-ray photoelectron spectroscopy results evidence that the iron-oxide surface is nearly stoichiometric magnetite. X-ray diffraction results indicate monocrystalline epitaxy and almost complete structural relaxation. Scanning transmission electron micrographs reveal that the microstructure consists of domains which are separated by antiphase boundaries or twin boundaries. The magnetite films show rather slow magnetization behavior in comparison with bulk crystals probably due to reduced magnetization at antiphase boundaries in small applied fields.
Address
Corporate Author				Thesis
Publisher	American Institute of Physics	Place of Publication	New York, N.Y.	Editor
Language		Wos	000286009800055	Publication Date	2011-01-07
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0003-6951;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	3.411	Times cited	27	Open Access
Notes	The authors acknowledge financial support by DFG through Forschergruppe FOR 1162.			Approved	Most recent IF: 3.411; 2011 IF: 3.844
Call Number	UA @ lucian @ c:irua:88653			Serial	3532
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Author	Li, Y.; Tan, H.; Yang, X.-Y.; Goris, B.; Verbeeck, J.; Bals, S.; Colson, P.; Cloots, R.; Van Tendeloo, G.; Su, B.-L.
Title	Well shaped Mn₃O₄ nano-octahedra with anomalous magnetic behavior and enhanced photodecomposition properties			Type	A1 Journal article
Year	2011	Publication	Small	Abbreviated Journal	Small
Volume	7	Issue	4	Pages	475-483
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Very uniform and well shaped Mn3O4 nano-octahedra are synthesized using a simple hydrothermal method under the help of polyethylene glycol (PEG200) as a reductant and shape-directing agent. The nano-octahedra formation mechanism is monitored. The shape and crystal orientation of the nanoparticles is reconstructed by scanning electron microscopy and electron tomography, which reveals that the nano-octahedra only selectively expose {101} facets at the external surfaces. The magnetic testing demonstrates that the Mn3O4 nano-octahedra exhibit anomalous magnetic properties: the Mn3O4 nano-octahedra around 150 nm show a similar Curie temperature and blocking temperature to Mn3O4 nanoparticles with 10 nm size because of the vertical axis of [001] plane and the exposed {101} facets. With these Mn3O4 nano-octahedra as a catalyst, the photodecomposition of rhodamine B is evaluated and it is found that the photodecomposition activity of Mn3O4 nano-octahedra is much superior to that of commercial Mn3O4 powders. The anomalous magnetic properties and high superior photodecomposition activity of well shaped Mn3O4 nano-octahedra should be related to the special shape of the nanoparticles and the abundantly exposed {101} facets at the external surfaces. Therefore, the shape preference can largely broaden the application of the Mn3O4 nano-octahedra.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Weinheim	Editor
Language		Wos	000288080400008	Publication Date	2011-01-21
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	1613-6810;	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	8.643	Times cited	131	Open Access
Notes	This work was realized in the frame of an Interuniversity Attraction Poles Program (Inanomat-P6/17)-Belgian State-Belgian Science Policy and the project “Redugaz”, financially supported by the European community and the Wallon government in the frame of Interreg IV (France-Wallonie). B. L. S. acknowledges the Chinese Central Government for an “Expert of the State” position in the program of “Thousand talents” and the Chinese Ministry of Education for a Changjiang Scholar position at the Wuhan University of Technology. H. T. acknowledges the financial support from FWO-Vlaanderen (Project nr. G.0147.06). J.V. thanks the financial support from the European Union under Framework 6 program for Integrated Infrastructure Initiative, Reference 026019 ESTEEM.			Approved	Most recent IF: 8.643; 2011 IF: 8.349
Call Number	UA @ lucian @ c:irua:87908			Serial	3914
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Author	Dharanipragada, N.V.R.A.; Meledina, M.; Galvita, V.V.; Poelman, H.; Turner, S.; Van Tendeloo, G.; Detavernier, C.; Marin, G.B.
Title	Deactivation study of Fe₂O₃-CeO₂ during redox cycles for CO production from CO₂			Type	A1 Journal article
Year	2016	Publication	Industrial and engineering chemistry research	Abbreviated Journal	Ind Eng Chem Res
Volume	55	Issue	55	Pages	5911-5922
Keywords	A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract	Deactivation was investigated in Fe2O3-CeO2 oxygen storage materials during repeated H-2-reduction and CO2-reoxidation. In situ XRD, XAS, and TEM were used to identify phases, crystallite sizes, and morphological changes upon cycling operation. The effect of redox cycling was investigated both in Fe-rich (80 wt % Fe2O3-CeO2) and Ce-rich (10 wt %Fe2O3-CeO2) materials. The former consisted of 100 nm Fe2O3 particles decorated with 5-10 nm Ce1-xFexO2-x. The latter presented CeO2 with incorporated Fe, i.e. a solid solution of Ce1-xFexO2-x, as the main oxygen carrier. By modeling the EXAFS Ce-K signal for as-prepared 10 wt %Fe2O3-CeO2, the amount of Fe in CeO2 was determined as 21 mol %, corresponding to 86% of the total iron content. Sintering and solid solid transformations, the latter including both new phase formation and element segregation, were identified as deactivation pathways upon redox cycling. In Ce-rich material, perovskite (CeFeO3) was identified by XRD. This phase remained inert during reduction and reoxidation, resulting in an overall lower oxygen storage capacity. Further, Fe segregated from the solid solution, thereby decreasing its reducibility. In addition, an increase in crystallite size occurred for all phases. In Fe-rich material, sintering is the main deactivation pathway, although Fe segregation from the solid solution and perovskite formation cannot be excluded.
Address
Corporate Author				Thesis
Publisher		Place of Publication	Washington, D.C.	Editor
Language		Wos	000376825300013	Publication Date	2016-04-22
Series Editor		Series Title		Abbreviated Series Title
Series Volume		Series Issue		Edition
ISSN	0888-5885; 1520-5045	ISBN		Additional Links	UA library record; WoS full record; WoS citing articles
Impact Factor	2.843	Times cited	26	Open Access
Notes				Approved	Most recent IF: 2.843
Call Number	UA @ lucian @ c:irua:134214			Serial	4158
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