SYNTHESIS OF HIGH PERMEABILITY CU-MG-ZN FERRITES USING OXALATE PRECURSORS

We have synthesized Cu-Mg-Zn ferrites by using soft chemistry routes u sing oxalate precursors. Thermogravimetry (TG) studies have been carri ed out for selecting decomposition temperatures and weight loss measur ements, These studies reveal that in all the samples, decomposition oc curs 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 attrib uted to cation migration of Mg2+ ions to A-site. The density of sample s 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 ferr ite (mu(i) = 550).