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

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 Mg_xCu_(0.5-x)Zn_0.5Fe₂O₄ has the highest permeability (μ_i=2181) which is sufficiently higher than that reported for ETKMG-5 ferrite (μ_i =550)