Synthesis of high permeability Cu-Mg-Zn ferrites using oxalate precursors

Abstract

We have synthesized Cu-Mg-Zn ferrites by using soft chemistry routes using oxalate precursors. Thermogravimetry (TG) studies have been carried out for selecting decomposition temperatures and weight loss measurements, These studies reveal that in all the samples, decomposition occurs in two stages, The lattice parameters show a gradually decreasing trend with increasing Mg2+ content which is attributed to ionic radii of Cu2+ and Mg2+. The variation in saturation magnetization is attributed to cation migration of Mg2+ ions to A-site. The density of samples increases gradually with increasing Mg2+ content. This is attributed to the fact that Mg2+ ions have less ionic radii. The sample with x = 0.25 in MgxCu(0.5-x)Zn0.5Fe2O4 has the highest permeability (mu(i) = 2181) which is sufficiently higher than that reported for ETKMG-5 ferrite (mu(i) = 550)