The solid oxide type fuel cell using the same composite oxide gallate

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PROBLEM TO BE SOLVED : To provide : a gallate complex oxide with an A-site deficient perovskite structure that has high chemical stability at elevated temperatures and high oxygen ion conductivity; and a solid oxide fuel cell using the same.SOLUTION : The gallate complex oxide comprises an A-site deficient perovskite structure represented by the general formula (1) defined by AAGaMgO, where Ais at least one element selected from the group consisting of rare-earth elements; and Ais at least one selected from the group consisting of Ba, Sr and Ca. Here, x satisfies the relational expression (2) defined by x=2a-2z+1.2; y is a positive number satisfying the relational expression (3) defined by y=-3a+2z-0.2; and 0

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