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The electrical conductivity and thermoelectric power of the system Mg}Fe}O were measured as functions of oxygen activity (a O2 ) and cationic composition in the temperature range 11004T/3 3C41300. The isotherms of both electrical properties underwent a conspicuous change in trend at the same, characteristic oxygen activities, which was ascribed to a O2 -induced phase transitions from rock-salt structure to spinel structure to corrundum structure with successively increasing a O2 :s. The regiondoi:10.1006/jssc.1999.8490 fatcat:7j3fnqp5mvgoldizge72vjmwxm