Synthesis, thermal expansion and high-temperature electrical conductivity of Co-doped (Y,Са)FeO3-δ with orthorhombic perovskite structure

Kalyuzhnaya, A.S.; Drozhzhin, O.A.; Istomin, S.Y.; Gippius, A.A.; Kazakov, S.M.; Lyskov, N.V.; Rozova, M.G.; Antipov, E.V.

Авторы: Kalyuzhnaya A.S., Drozhzhin O.A., Istomin S.Ya, Gippius A.A., Kazakov S.M., Lyskov N.V., Rozova M.G., Antipov E.V.
Журнал: Materials Research Bulletin
Том: 66
Год издания: 2015
Издательство: Pergamon Press Ltd.
Местоположение издательства: United Kingdom
Первая страница: 239
Последняя страница: 243
DOI: 10.1016/j.materresbull.2015.02.006
Аннотация: Orthorhombic perovskites Y1-xСаxFe1-yCoyO3-δ (0.1≤х≤0.2, 0.1≤y≤0.2 and х=0.1, y=0.3) were synthesized in air by the citrate route at 1150-1300оC. High-temperature X-ray powder diffraction (HT XRPD) data for Y0.9Са0.1Fe0.8Co0.2O3-δ at 25-800оC showed no phase transition with calculated thermal expansion coefficient (TEC) of 11.9 ppm K-1. High-temperature electrical conductivity measurements revealed almost composition independent conductivity values of 22-27 S/cm at 900оC. No chemical interaction of Y0.8Са0.2Fe0.9Co0.1O3-δ with (Zr,Y)O2-x (YSZ) or (Ce,Gd)O2-x (GDC) was observed up to 1000oC and 1100оС, respectively. Partial replacement of Y by Pr according to formula Y0.8-zPrzCa0.2Fe0.7Co0.3O3-δ, 0.1≤z≤0.35, leads to an increase of both electrical conductivity up to 50 S/cm (z=0.3) at 900оC and dilatometry measured TEC up to 15.1 ppmK-1. Moderate values of electrical conductivity in combination with low TEC and stability towards chemical interaction with typical SOFC electrolytes make Co-doped Y1-xCaxFeO3-δ promissing cathode materials for intermediate temperature solid oxide fuel cells (IT-SOFC).
Добавил в систему: Истомин Сергей Яковлевич

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Synthesis, thermal expansion and high-temperature electrical conductivity of Co-doped (Y,Са)FeO3-δ with orthorhombic perovskite structureстатья

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