Cation distribution in NixMn1−xFe2O4 ferrites

The cation distribution in the spinel ferrite system NixMn1−xFe2O4 (with x=0, 0.25, 0.5, 0.75 and 1) has been calculated analytically for the first time in the closed form as a function of thermodynamic parameters by making reasonable assumption. The manganese and nickel site occupancies show a nearly linear composition dependence. Trivalent iron occupancies reflect the transition from octahedral to tetrahedral sites. The calculated results are consistent with those from X-ray diffraction (XRD).