MIXED ION CONDUCTOR

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PROBLEM TO BE SOLVED : To provide a mixed ion conductor of an oxide having a particularly high proton conductivity for an electrochemical device such as a sensor and a fuel cell. SOLUTION : This mixed ion conductor is composed of an proton conductive oxide having oxide ion conductivity, the oxide has a unit lattice composition expressed by a formula SraLbCecMdO3-α (0<α<1.5), Mg, Ca or Ba is used as a substituent element L, a rare-earth element is used as a substituent element M, and in the formula, (a), (b), (c), (d) are set such that 0.9≤a≤1.1, 0≤b≤0.1, 0.7≤c≤1.0, and 0.16≤d≤0.40. COPYRIGHT : (C)2007, JPO&INPIT