The effect of compositional variation on the structure and magnetic properties of Ni-Mg ferrites with compositions Ni1-xMgxFe2O4 for [x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0], prepared by a conventional double sintering ceramic technique, sintered at 1350 οC for 4.5 hours were investigated. The structural characterization of the samples has been performed by X-ray diffraction (XRD). X-ray diffraction results confirmed the single-phase spinel structures of all the ferrite samples. The lattice parameters have been found to increase linearly with increasing Mg concentration, obeying Vegard's law. The bulk density and X-ray density of the samples decrease monotonically with increasing Mg content. SEM micrographs exhibit a decrease in grain size with increasing Mg content. The Curie temperature of Ni-Mg ferrites was found to decrease with an increase in the Mg2+ content due to the reduction of A-B exchange interactions. The complex initial permeability is found to decrease as the Mg content increases which is consistent with the variation of density with Mg ions.

Keywords: XRD, Lattice parameter, Microstructure, Permeability, Curie temperature.