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PROBLEM TO BE SOLVED : To provide a conductive oxide sintered body that can achieve high conductivity at room temperature. SOLUTION : A conductive oxide sintered body for gas sensors contains a crystal phase having a perovskite type oxide crystal structure represented by compositional formula : REaCubFecNidOx (RE is a rare earth element, a+b+c+d=1, 1.25≤x≤1.75), where a, b, c, d satisfy 0.375≤a≤0.524, 0.050
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