Crystal Structure and Property of Perovskite-Type Oxides Containing Ion Vacancy |
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| Authors: | Sumio Kato Masataka Ogasawara Mikio Sugai Shinichi Nakata |
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| Institution: | (1) Faculty of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen-cho, Akita, 010-8502, Japan |
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| Abstract: | Studies on the role of oxygen vacancy in structural change of nonstoichiometric perovskites and a property of oxygen-deficient perovskite-related K2NiF4 compounds are reviewed.The structural changes on which the authors focused are cation ordering and lattice distortion. The relationship between the distortion and oxygen vacancy was investigated by comparing the structures of Sr2(Sr1-xMx)TaO6-d (M = Ca2+ and Nd3+) solid solutions. It was found that distortion of a perovskite-type lattice decreased with an increasing amount of oxygen vacancies. In order to investigate the relationship between the cation ordering on octahedral sites and oxygen vacancy, structures of stoichiometric Sr2-xLaxCo1-yTa1+yO6 and oxygen-deficient Sr2-xLaxMg1-yTa1+yO6-d solid solutions were compared. The authors' work reveals that the cation ordering affects the amount of oxygen vacancies in addition to cation charge and size. |
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| Keywords: | perovskite crystal structure oxygen vacancy cation ordering lattice distortion |
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