Oxide ion conductor and its use

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PROBLEM TO BE SOLVED : To obtain an oxide ionic conductor having high heat resistance, scarcely being influenced by an oxygen partial pressure and capable of manifesting high oxide ionic (mixed) conductivity by providing a composition in which a part of the site A in a rare earth gallate-based oxide represented by ABO3 of a perovskite type structure is replaced with an alkaline earth metal and a part of the site B therein is replaced with a nontransition metal such as Mg. SOLUTION : This oxide ionic conductor is represented by the general formula : Ln1-x Ax Ga1-y-z B1y B2z O3 Ln is one more kinds of La, Ce, Pr, Nd and Sm; A is one or more kinds of Sr, Ca and Ba; B1 is one or more kinds of Mg, Al and In; B2 is one or more kinds of Co, Fe, Ni and Cu; (x) is 0.05-0.3; (y) is 0-0.29; (z) is 0.01-0.3; [(y)+(z)] is 0.025-0.3}. The oxide ionic conductor is useful as an electrolyte for a solid oxide type fuel cell, a gas sensor such as an oxygen sensor and an oxygen separation membrane for an electrochemical type oxygen pump.