Effect of substitution of divalent ions on the electrical and magnetic properties of Ni-Zn-Me ferrites

The effect of Cu2+, Cd2+ Co2+, Ca2+, Mn2+, and Mg2+ ions on the physical pr operties of stoichiometric Ni0.5Zn0.5 Fe2O4 ferrite is investigated. The sp ecimen is prepared by the conventional manufacturing method without atmosph ere control. The divalent ions replace one-half the Ni2+ ion molar content. We found that the magnetic and electrical properties of Ni-Zn ferrite chan ges considerably with the substituent species. Copper ions play an importan t role in lowering the sintering temperature and increasing density Mangane se and cobalt ions increase electrical resistivity by about two orders of m agnitude, while the Ca and Mn ions improve thermal stability of the initial permeability. We also discuss our investigation of the physical properties of the Ni-Zn-Me ferrites on the basis of site occupation of the cation spe cies in the spinel structure.