“Anion ordering in fluorinated La2CuO4”. Hadermann J, Abakumov AM, Van Tendeloo G, Shpanchenko RV, Oleinikov PN, Antipov EV s.l., page 133 (1999).
Keywords: H1 Book chapter; Electron microscopy for materials research (EMAT)
|
“The local structure of YBCO based materials by TEM”. Van Tendeloo G, Lebedev OI, Verbist K, Abakumov AM, Shpanchenko RV, Antipov EV, Blank DHA Kluwer Academic, Dordrecht, page 11 (1999).
Keywords: H1 Book chapter; Electron microscopy for materials research (EMAT)
|
“Structural changes in fluorinated T{'} and T* phases”. Hadermann J, Abakumov AM, Lebedev OI, Antipov EV, Van Tendeloo G, , 193 (2000)
Keywords: P3 Proceeding; Electron microscopy for materials research (EMAT)
|
“Structure of Y123 and Y247 fluorinated phases by HREM”. Lebedev OI, Van Tendeloo G, Abakumov AM, Shpanchenko RV, Rozova MG, Antipov EV, Electron microscopy: vol. 3 , 297 (1998)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
|
“AVPO4F (A = Li, K): A 4 V Cathode Material for High-Power Rechargeable Batteries”. Fedotov SS, Khasanova NR, Samarin AS, Drozhzhin OA, Batuk D, Karakulina OM, Hadermann J, Abakumov AM, Antipov EV, Chemistry of materials 28, 411 (2016). http://doi.org/10.1021/acs.chemmater.5b04065
Abstract: A novel potassium-based fluoride-phosphate, KVPO4F, with a KTiOPO4 (KTP) type structure is synthesized and characterized. About 85% of potassium has been electrochemically extracted on oxidation producing a cathode material with attractive performance for Li-ion batteries. The material operates at the electrode potential near 4V vs Li/Li+ exhibiting a sloping voltage profile, extremely low polarization, small volume change of about 2% and excellent rate capability, maintaining more than 75% of the initial capacity at 40C discharge rate without significant fading.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 46
DOI: 10.1021/acs.chemmater.5b04065
|
“Synthesis, structure and electrochemical properties of LiNaCo0.5Fe0.5PO4F fluoride-phosphate”. Fedotov SS, Kuzovchikov SM, Khasanova NR, Drozhzhin OA, Filimonov DS, Karakulina OM, Hadermann J, Abakumov AM, Antipov EV, Journal of solid state chemistry 242, 70 (2016). http://doi.org/10.1016/j.jssc.2016.02.042
Abstract: LiNaCo 0.5 Fe 0.5 PO 4 F fluoride-phosphate was synthesized via conventional solid-state and novel freeze-drying routes. The crystal structure was refined based on neutron powder diffraction (NPD) data and validated by electron diffraction (ED) and high-resolution transmission electron microscopy (HRTEM). The alkali ions are ordered in LiNaCo 0.5 Fe 0.5 PO 4 F and the transition metals jointly occupy the same crystallographic sites. The oxidation state and oxygen coordination environment of the Fe atoms were verified by 57 Fe Mössbauer spectroscopy. Electrochemical tests of the LiNaCo 0.5 Fe 0.5 PO 4 F cathode material demonstrated a reversible activity of the Fe 3+ /Fe 2+ redox couple at the electrode potential near 3.4 V and minor activity of the Co 3+ /Co 2+ redox couple over 5 V vs Li/Li + . The material exhibits a good capacity retention in the 2.4÷4.6 V vs Li/Li + potential range with the delivered discharge capacity of more than 82% (theo.) regarding Fe 3+ /Fe 2+ .
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.299
Times cited: 1
DOI: 10.1016/j.jssc.2016.02.042
|
“Tuning the crystal structure of A2CoPO4F(A=Li,Na) fluoride-phosphates : a new layered polymorph of LiNaCoPO4F”. Fedotov SS, Aksyonov DA, Samarin AS, Karakulina OM, Hadermann J, Stevenson KJ, Khasanova NR, Abakumov AM, Antipov E V, European journal of inorganic chemistry 2019, 4365 (2019). http://doi.org/10.1002/EJIC.201900660
Abstract: Co-containing fluoride-phosphates are of interest in sense of delivering high electrode potentials and attractive specific energy values as positive electrode materials for rechargeable batteries. In this paper we report on a new Co-based fluoride-phosphate, LiNaCoPO4F, with a layered structure (2D), which was Rietveld-refined based on X-ray powder diffraction data [P2(1)/c, a = 6.83881(4) angstrom, b = 11.23323(5) angstrom, c = 5.07654(2) angstrom, beta = 90.3517(5) degrees, V = 389.982(3) angstrom(3)] and validated by electron diffraction and high-resolution scanning transmission electron microscopy. The differential scanning calorimetry measurements revealed that 2D-LiNaCoPO4F forms in a narrow temperature range of 520-530 degrees C and irreversibly converts to the known 3D-LiNaCoPO4F modification (Pnma) above 530 degrees C. The non-carbon-coated 2D-LiNaCoPO4F shows reversible electrochemical activity in Li-ion cell in the potential range of 3.0-4.9 V vs. Li/Li+ with an average potential of approximate to 4.5 V and in Na-ion cell in the range of 3.0-4.5 V vs. Na/Na+ exhibiting a plateau profile centered around 4.2 V, in agreement with the calculated potentials by density functional theory. The energy barriers for both Li+ and Na+ migration in 2D-LiNaCoPO4F amount to 0.15 eV along the [001] direction rendering 2D-LiNaCoPO4F as a viable electrode material for high-power Li- and Na-ion rechargeable batteries. The discovery and stabilization of the 2D-LiNaCoPO4F polymorph indicates that temperature influence on the synthesis of A(2)MPO(4)F fluoride-phosphates needs more careful examination with perspective to unveil new structures.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 2.444
DOI: 10.1002/EJIC.201900660
|
“Structure determination of YBCO fluorinated phases by HREM”. Van Tendeloo G, Lebedev OI, Shpanchenko RV, Antipov EV, Journal of electron microscopy 1, 23 (1997)
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 0.9
|
“Structural transformation in fluorinated LaACuGaO5 (A=Ca, Sr) brownmillerites”. Hadermann J, Van Tendeloo G, Abakumov AM, Pavlyuk BP, Rozova MG, Antipov EV, International journal of inorganic materials 2, 493 (2000). http://doi.org/10.1016/S1466-6049(00)00072-6
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 13
DOI: 10.1016/S1466-6049(00)00072-6
|
“The superconducting bismuth-based mixed oxides”. Antipov EV, Khasanova NR, Pshirkov JS, Putilin SN, Bougerol C, Lebedev OI, Van Tendeloo G, Baranov AN, Park YW, Current applied physics
T2 –, QTSM and QFS 02 Symposium, MAY 08-10, 2002, SEOUL, SOUTH KOREA 2, 425 (2002). http://doi.org/10.1016/S1567-1739(02)00105-0
Abstract: The present paper describes the synthesis, characterization of mixed-valence bismuthates with three- or two-dimensional perovskite-like structures and structural criteria that influence superconductivity in these compounds. Single-phase samples of Sr1-xKxBiO3 were prepared for the broad range of K-content: 0.25 less than or equal to x less than or equal to 0.65. For these bismuthates the symmetry of the structure changes from monoclinic to orthorhombic and finally to tetragonal upon increasing the K-content thus resulting in the decrease of the Bi-O distances and reduction of the network distortions. Superconductivity with maximum T-c = 12 K exists in the narrow range (x approximate to 0.5-0.6) within the stability field of the tetragonal phase (0.33 less than or equal to x less than or equal to 0.65), when the three-dimensional octahedral framework has close to the ideal perovskite structure arrangement. The layered type (Ba,K)(3)Bi2O7 and (Ba,K)(2)BiO4 bismuthates belonging to the A(n+1)B(n)O(3n+1) homologous series were investigated. Buckling of the (BiO2) layers in the structure of the n = 2 member occurs due to the ordering of alkaline- and alkaline-earth cations between two independent positions. The formation of the one-layer bismuthate was revealed by Electron Microscopy and XRPD studies. Both types of compounds are considered to be possible candidates for new superconducting materials among bismuthates. (C) 2002 Published by Elsevier Science B.V.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.971
Times cited: 2
DOI: 10.1016/S1567-1739(02)00105-0
|
“Study of hydrogen peroxide reactions on manganese oxides as a tool to decode the oxygen reduction reaction mechanism”. Ryabova AS, Bonnefont A, Zagrebin P, Poux T, Sena RP, Hadermann J, Abakumov AM, Kerangueven G, Istomin SY, Antipov EV, Tsirlina GA, Savinova ER, ChemElectroChem 3, 1667 (2016). http://doi.org/10.1002/CELC.201600236
Abstract: Hydrogen peroxide has been detected as a reaction intermediate in the electrochemical oxygen reduction reaction (ORR) on transition-metal oxides and other electrode materials. In this work, we studied the electrocatalytic and catalytic reactions of hydrogen peroxide on a set of Mn oxides, Mn2O3, MnOOH, LaMnO3, MnO2, and Mn3O4, that adopt different crystal structures to shed light on the mechanism of the ORR on these materials. We then combined experiment with kinetic modeling with the objective to correlate the differences in the ORR activity to the kinetics of the elementary reaction steps, and we uncovered the importance of structural and compositional factors in the catalytic activity of the Mn oxides. We concluded that the exceptional activity of Mn2O3 in the ORR is due to its high catalytic activity both in the reduction of oxygen to hydrogen peroxide and in the decomposition of the latter, and furthermore, we proposed a tentative link between crystal structure and reactivity.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 4.136
Times cited: 20
DOI: 10.1002/CELC.201600236
|
“Synthesis and investigation of novel Mn-based oxyfluoride Sr2Mn2O5-xF1+x”. Lobanov MV, Abakumov AM, Sidorova AV, Rozova MG, D'yachenko OG, Antipov EV, Hadermann J, Van Tendeloo G, Solid state sciences 4, 19 (2002). http://doi.org/10.1016/S1293-2558(01)01209-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.811
Times cited: 21
DOI: 10.1016/S1293-2558(01)01209-2
|
“Synthesis and structural investigations on the new Sr1.32Mn0.83Cu0.17O3 compound”. Abakumov AM, Mironov AV, Govorov VA, Lobanov MV, Rozova MG, Antipov EV, Lebedev OI, Van Tendeloo G, Solid state sciences 5, 1117 (2003). http://doi.org/10.1016/S1293-2558(03)00141-9
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.811
Times cited: 8
DOI: 10.1016/S1293-2558(03)00141-9
|
“Synthesis and structure of Sr2MnGaO5+\delta brownmillerites with variable oxygen content”. Abakumov AM, Rozova MG, Alekseeva AM, Kovba ML, Antipov EV, Lebedev OI, Van Tendeloo G, Solid state sciences 5, 871 (2003). http://doi.org/10.1016/S1293-2558(03)00112-2
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.811
Times cited: 12
DOI: 10.1016/S1293-2558(03)00112-2
|
“Evaluation of Ce-doped Pr2CuO4for potential application as a cathode material for solid oxide fuel cells”. Kolchina L M, Lyskov NV, Kuznetsov AN, Kazakov SM, Galin MZ, Meledin A, Abakumov AM, Bredikhin SI, Mazo GN, Antipov EV, RSC advances 6, 101029 (2016). http://doi.org/10.1039/C6RA21970E
Abstract: Pr2−xCexCuO4 (x = 0.05; 0.1; 0.15) samples were synthesized and systematically characterized towards application as a cathode material for solid oxide fuel cells (SOFCs). High-temperature electrical conductivity, thermal expansion, and electrocatalytic activity in the oxygen reduction reaction (ORR) were examined. The electrical conductivity of Pr2−xCexCuO4 oxides demonstrates semiconducting behavior up to 900 °C. Small Ce-doping (2.5 at%) allows an increase in electrical conductivity from 100 to 130 S cm−1 in air at 500–800 °C. DFT calculations revealed that the density of states directly below the Fermi level, comprised mainly of Cu 3d and O 2p states, is significantly affected by atoms in rare earth positions, which might give an indication of a correlation between calculated electronic structures and measured conducting properties. Ce-doping in Pr2−xCexCuO4 slightly increases TEC from 11.9 × 10−6 K−1 for x = 0 to 14.2 × 10−6 K−1 for x = 0.15. Substitution of 2.5% of Pr atoms in Pr2CuO4 by Ce is effective to enhance the electrochemical performance of the material as a SOFC cathode in the ORR (ASR of Pr1.95Ce0.05CuO4 electrode applied on Ce0.9Gd0.1O1.95 electrolyte is 0.39 Ω cm2 at 750 °C in air). The peak power density achieved for the electrolyte-supported fuel cell with the Pr1.95Ce0.05CuO4 cathode is 150 mW cm−2 at 800 °C
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 3.108
Times cited: 7
DOI: 10.1039/C6RA21970E
|
“Compositionally induced phase transition in the Ca2MnGa1-xAlxO5 solid solutions: ordering of tetrahedral chains in brownmillerite structure”. Abakumov AM, Kalyuzhnaya AS, Rozova MG, Antipov EV, Hadermann J, Van Tendeloo G, Solid state sciences 7, 801 (2005). http://doi.org/10.1016/j.solidstatesciences.2005.01.020
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.811
Times cited: 38
DOI: 10.1016/j.solidstatesciences.2005.01.020
|
“Local structure of perovskite-based “Pb2Fe2O5””. Hadermann J, Abakumov AM, Nikolaev IV, Antipov EV, Van Tendeloo G, Solid state sciences 10, 382 (2008). http://doi.org/10.1016/j.solidstatesciences.2007.12.008
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 1.811
Times cited: 29
DOI: 10.1016/j.solidstatesciences.2007.12.008
|
“Anion rearrangements in fluorinated Nd2CuO3.5”. Corbel G, Attfield JP, Hadermann J, Abakumov AM, Alekseeva AM, Rozova MG, Antipov EV, Chemistry of materials 15, 189 (2003). http://doi.org/10.1021/cm021102m
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 9
DOI: 10.1021/cm021102m
|
“Synthesis and crystal structure of novel CaRMnSnO6(R = La, Pr, Nd, Sm-Dy) double perovskites”. Abakumov AM, Rossell MD, Seryakov SA, Rozova MG, Markina MM, Van Tendeloo G, Antipov EV, Journal of materials chemistry 15, 4899 (2005). http://doi.org/10.1039/b510242a
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 8
DOI: 10.1039/b510242a
|
“Crystal structure, polymorphism, and properties of the new vanadyl phosphate Na4VO(PO4)2”. Panin RV, Shpanchenko RV, Mironov AV, Velikodny YA, Antipov EV, Hadermann J, Tarnopolsky VA, Yaroslavtsev AB, Kaul EE, Geibel C, Chemistry of materials 16, 1048 (2004). http://doi.org/10.1021/cm0351543
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 11
DOI: 10.1021/cm0351543
|
“Synthesis and crystal structure of the Sr2Al1.07Mn0.93O5 brownmillerite”. Hadermann J, Abakumov AM, d' Hondt H, Kalyuzhnaya AS, Rozova MG, Markina MM, Mikheev MG, Tristan N, Klingeler R, Büchner B, Antipov EV, Journal of materials chemistry 17, 692 (2007). http://doi.org/10.1039/b614168d
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 31
DOI: 10.1039/b614168d
|
“Synthesis, cation ordering, and magnetic properties of the (Sb1-xPbx)2(Mn1-ySby)O4 solid solutions with the Sb2MnO4-type structure”. Abakumov AM, Rozova MG, Antipov EV, Hadermann J, Van Tendeloo G, Lobanov MV, Greenblatt M, Croft M, Tsiper EV, Llobet A, Lokshin KA, Zhao Y, Chemistry of materials 17, 1123 (2005). http://doi.org/10.1021/cm048791h
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 16
DOI: 10.1021/cm048791h
|
“Sn2-2xSbxFexO4 solid solutions as possible inert anode materials in aluminum electrolysis”. Govorov VA, Abakumov AM, Rozova MG, Borzenko AG, Vassiliev SY, Mazin VM, Afanasov MI, Fabritchnyi PB, Tsirlina GA, Antipov EV, Morozova EN, Gippius AA, Ivanov VV, Van Tendeloo G, Chemistry of materials 17, 3004 (2005). http://doi.org/10.1021/cm048145i
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 11
DOI: 10.1021/cm048145i
|
“Transmission electron microscopic study of the defect structure in Sr4Fe6O12+\delta compounds with variable oxygen content”. Rossell MD, Abakumov AM, Van Tendeloo G, Lomakov MV, Istomin SY, Antipov EV, Chemistry and materials 17, 4717 (2005). http://doi.org/10.1021/cm050777x
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 17
DOI: 10.1021/cm050777x
|
“Advanced electron microscopy and its possibilities to solve complex structures: application to transition metal oxides”. Van Tendeloo G, Hadermann J, Abakumov AM, Antipov EV, Journal of materials chemistry 19, 2660 (2009). http://doi.org/10.1039/b817914j
Abstract: Design and optimization of materials properties can only be performed through a thorough knowledge of the structure of the compound. In this feature article we illustrate the possibilities of advanced electron microscopy in materials science and solid state chemistry. The different techniques are briefly discussed and several examples are given where the structures of complex oxides, often with a modulated structure, have been solved using electron microscopy.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Times cited: 9
DOI: 10.1039/b817914j
|
“Spatial separation of covalent, ionic, and metallic interactions in Mg11Rh18B8 and Mg3Rh5B3”. Alekseeva AM, Abakumov AM, Leither-Jasper A, Schnelle W, Prots Y, Van Tendeloo G, Antipov EV, Grin Y, Chemistry: a European journal 19, 17860 (2013). http://doi.org/10.1002/chem.201301512
Abstract: The crystal structures of Mg11Rh18B8 and Mg3Rh5B3 have been investigated by using single-crystal X-ray diffraction. Mg11Rh18B8: space group P4/mbm; a=17.9949(7), c=2.9271(1)angstrom; Z=2. Mg3Rh5B3: space group Pmma; a=8.450(2), b=2.8644(6), c=11.602(2)angstrom; Z=2. Both crystal structures are characterized by trigonal prismatic coordination of the boron atoms by rhodium atoms. The [BRh6] trigonal prisms form arrangements with different connectivity patterns. Analysis of the chemical bonding by means of the electron-localizability/electron-density approach reveals covalent BRh interactions in these arrangements and the formation of BRh polyanions. The magnesium atoms that are located inside the polyanions interact ionically with their environment, whereas, in the structure parts, which are mainly formed by Mg and Rh atoms, multicenter (metallic) interactions are observed. Diamagnetic behavior and metallic electron transport of the Mg11Rh18B8 and Mg3Rh5B3 phases are in agreement with the bonding picture and the band structure.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 5.317
Times cited: 5
DOI: 10.1002/chem.201301512
|
“[SrF0.8(OH)0.2]2.526[Mn6O12]: columnar rock-salt fragments inside the todorokite-type tunnel structure”. Abakumov AM, Hadermann J, Van Tendeloo G, Kovba ML, Skolis YY, Mudretsova SN, Antipov EV, Volkova OS, Vasiliev AN, Tristan N, Klingeler R, Büchner B, Chemistry of materials 19, 1181 (2007). http://doi.org/10.1021/cm062508s
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 9
DOI: 10.1021/cm062508s
|
“Superspace description, crystal structures, and electric conductiof the Ba4In6-xMgxO13-x/2 solid solutions”. Abakumov AM, Rossell MD, Gutnikova OY, Drozhzhin OA, Leonova LS, Dobrovolsky YA, Istomin SY, Van Tendeloo G, Antipov EV, Chemistry of materials 20, 4457 (2008). http://doi.org/10.1021/cm8004216
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 15
DOI: 10.1021/cm8004216
|
“Tetrahedral chain order in the Sr2Fe2O5 brownmillerite”. d' Hondt H, Abakumov AM, Hadermann J, Kalyuzhnaya AS, Rozova MG, Antipov EV, Van Tendeloo G, Chemistry of materials 20, 7188 (2008). http://doi.org/10.1021/cm801723b
Abstract: The crystal structure of the Sr2Fe2O5 brownmillerite has been investigated using electron diffraction and high resolution electron microscopy. The Sr2Fe2O5 structure demonstrates two-dimensional order: the tetrahedral chains with two mirror-related configurations (L and R) are arranged within the tetrahedral layers according to the −L−R−L−R− sequence, and the layers themselves are displaced with respect to each other over 1/2[111] or 1/2[11] vectors of the brownmillerite unit cell, resulting in different ordered stacking variants. A unified superspace model is constructed for ordered stacking sequences in brownmillerites based on the average brownmillerite structure with a = 5.5298(4)Å, b = 15.5875(12)Å, c = 5.6687(4)Å, and (3 + 1)-dimensional superspace group I2/m(0βγ)0s, q = βb* + γc*, 0 ≤ β ≤ 1/2, 0 ≤ γ ≤ 1.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 64
DOI: 10.1021/cm801723b
|
“Antiferroelectric (Pb,Bi)1-xFe1+xO3-y perovskites modulated by crystallographic shear planes”. Abakumov AM, Batuk D, Hadermann J, Rozova MG, Sheptyakov DV, Tsirlin AA, Niermann D, Waschowski F, Hemberger J, Van Tendeloo G, Antipov EV, Chemistry of materials 23, 255 (2011). http://doi.org/10.1021/cm102907h
Abstract: We demonstrate for the first time a possibility to vary the anion content in perovskites over a wide range through a long-range-ordered arrangement of crystallographic shear (CS) planes. Anion-deficient perovskites (Pb,Bi)1−xFe1+xO3−y with incommensurately modulated structures were prepared as single phases in the compositional range from Pb0.857Bi0.094Fe1.049O2.572 to Pb0.409Bi0.567Fe1.025O2.796. Using a combination of electron diffraction and high-resolution scanning transmission electron microscopy, we constructed a superspace model describing a periodic arrangement of the CS planes. The model was verified by refinement of the Pb0.64Bi0.32Fe1.04O2.675 crystal structure from neutron powder diffraction data ((3 + 1)D S.G. X2/m(α0γ), X = [1/2,1/2,1/2,1/2], a = 3.9082(1) Å, b = 3.90333(8) Å, c = 4.0900(1) Å, β = 91.936(2)°, q = 0.05013(4)a* + 0.09170(3)c* at T = 700 K, RP = 0.036, RwP = 0.048). The (Pb,Bi)1−xFe1+xO3−y structures consist of perovskite blocks separated by CS planes confined to nearly the (509)p perovskite plane. Along the CS planes, the perovskite blocks are shifted with respect to each other over the 1/2[110]p vector that transforms the corner-sharing connectivity of the FeO6 octahedra in the perovskite framework to an edge-sharing connectivity of the FeO5 pyramids at the CS plane, thus reducing the oxygen content. Variation of the chemical composition in the (Pb,Bi)1−xFe1+xO3−y series occurs mainly because of a changing thickness of the perovskite block between the interfaces, that can be expressed through the components of the q vector as Pb6γ+2αBi1−7γ−αFe1+γ−αO3−3γ−α. The Pb, Bi, and Fe atoms are subjected to strong displacements occurring in antiparallel directions on both sides of the perovskite blocks, resulting in an antiferroelectric-type structure. This is corroborated by the temperature-, frequency-, and field-dependent complex permittivity measurements. Pb0.64Bi0.32Fe1.04O2.675 demonstrates a remarkably high resistivity >0.1 T Ω cm at room temperature and orders antiferromagnetically below TN = 608(10) K.
Keywords: A1 Journal article; Electron microscopy for materials research (EMAT)
Impact Factor: 9.466
Times cited: 29
DOI: 10.1021/cm102907h
|