Crystal structure and high-temperature electrical conductivity of novel perovskite-related gallium and indium oxides

Istomin, S.Y.; Antipov, E.V.; Fedotov, Y.S.; Bredikhin, S.I.; Lyskov, N.V.; Shafeie, S.; Svensson, G.; Liu, Y.; Shen, Z.

Авторы: Istomin S.Ya, Antipov E.V., Fedotov Yu S., Bredikhin S.I., Lyskov N.V., Shafeie S., Svensson G., Liu Y., Shen Z.
Журнал: Journal of Solid State Electrochemistry
Том: 18
Год издания: 2014
Издательство: Springer Verlag
Местоположение издательства: Germany
Первая страница: 1415
Последняя страница: 1423
DOI: 10.1007/s10008-013-2190-4
Аннотация: Novel complex oxides Sr2Ga1+xIn1-xO5, x=0.0-0.2 with brownmillerite-type structure were prepared in air at T=1273 K, 24 h. Study of the crystal structure of Sr2Ga1.1In0.9O5 refined using X-ray powder diffraction data (S.G. Icmm, a = 5.9694(1) Å, b = 15.2091(3) Å, c = 5.7122(1) Å, χ2 = 2.48, RF2 = 0.0504, Rp = 0.0458) revealed ordering of Ga3+ and In3+ cations over tetrahedral and octahedral positions, respectively. A partial replacement of Sr2+ by La3+ according to formula Sr1-yLayGa0.5In0.5O2.5+y/2, leads to the formation of a cubic perovskite (a = 4.0291(5) Å) for y=0.3. No ordering of oxygen vacancies or cations was observed in Sr0.7La0.3Ga0.5In0.5O2.65 as revealed by electron diffraction study. The trace diffusion coefficient (DT) of oxygen for cubic perovskite Sr0.7La0.3Ga0.5In0.5O2.65 is in the range 2.0×10-9-6.3×10-8 cm2/s with activation energy 1.4(1) eV as determined by isotopic exchange depth profile (IEDP) technique using secondary ion mass spectrometry (SIMS) at 973-1223 K. These values are close to those reported for Ca-doped ZrO2. High-temperature electrical conductivity of Sr0.7La0.3Ga0.5In0.5O2.65 studied by AC impedance was found to be nearly independent on oxygen partial pressure. Calculated values of activation energy at T<1073 K for hole and oxide-ion conductivities are 0.96 and 1.10 eV, respectively.
Добавил в систему: Истомин Сергей Яковлевич

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Crystal structure and high-temperature electrical conductivity of novel perovskite-related gallium and indium oxidesстатья

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