Abstract
The subsolidus phase relations in the system MnFe2O4–Mn3O4 were established at temperatures between 450°C and 960°C under the oxygen partial pressures controlled by a hematite-magnetite buffer. The existence of two partial solid solutions of the end-members, a cubic phase of MnFe2O4 and a tetragonal phase of Mn3O4, were confirmed at the temperatures. The value of x in MnxFe3−xO4 of the cubic and the tetragonal phases was determined by a microprobe analysis. The two-phase region composed of these phases becomes wider with decreasing temperature as expected from the previous works. The influence of oxygen partial pressure on cation distributions in the tetragonal phase was calculated by the thermodynamic approach. The result indicates that the phases formed in the present experiment are in the true binary system.
