Phase stability regions in Mg-Fe-O system were investigated against te
mperature, cationic composition, and oxygen partial pressure using ele
ctrical conductivity and thermoelectric power measurements. Using thes
e results, phase diagrams of the first kind (i.e., Po-2 vs. T) for fix
ed compositions and the second kind (i.e., composition vs. Po-2) at fi
xed temperatures were constructed extensively.