Interrelationship between cation inversion and structural, morphological, optical, and magnetic properties in Ni-substituted MgFe2O4 spinels
Cation inversion critically governs magnetic exchange in spinel ferrites, yet it is typically treated as a fixed structural form rather than a tunable variable. In this work, we show that Ni2+ substitution in magnesium ferrite, forming the isovalent solid-solution series Mg1−xNixFe2O4 (x = 0.0, 0.1, 0.3, 0.5), drives a...