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The preparation and electrical properties of a sintered body consisting of cubic spinel oxide MnFeNiO4 were investigated. A sintered body with cubic spinel and NaCl-type oxides prepared at 1400 °C in Ar could be converted to one consisting of monophase cubic spinel oxide by oxidation at 1000 °C for more than 48 h in air. The electrical conductivity of a sintered body consisting of monophase cubic...