Composite mixed conductor

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PROBLEM TO BE SOLVED : To provide a composite mixed conductor in which there is less deterioration over time and in which an oxygen permeating membrane can be formed. SOLUTION : The composite mixed conductor as a preferable embodiment has an oxygen ion conduction phase composed of complex oxide having a Ce-Re-O based composition (Re is Y or a rare earth element), and an electron conduction phase consisting of a perovskite-type complex oxide having an N-Ti-O based composition (N is Ba, Ca or Sr). The Re is at least one kind of element selected from a group consisting of Sm, Nd, Gd, La and Y. COPYRIGHT : (C)2009, JPO&INPIT