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PROBLEM TO BE SOLVED : To provide a solid electrolyte satisfying both of high ion conductivity at low temperature and reduction resistance. SOLUTION : A composite oxide is provided which is represented by composition formula : Ce1-x(LnA1-yLnBy)xO2-x/2 (wherein LnA and LnB are rare earth elements different form each other and are each selected from the group consisting of Sm, Gd, Pr, Nd, Y, Sc, Yb, La, Dy and Ho; x denotes 0
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