Influence of Cd2+ Ions Substitution on the Magnetic Properties of Ni-Cd Ferrites

Abstract

The polycrystalline of Ni-Cd ferrites were prepared by the technology sol-gel with participation of autocombustion and sintered at temperature 1573 K in air. Low field hysteresis measurement was carried out at room temperature at frequency of 200 Hz and at the field range 1600-16000 A/m. The increase of Cd 2+ ions yields the increase of specific saturation magnetization σs and magnetic moment mexp up to x  0.3 then decrease thereafter. The Neel's two sublattice model can be applied to the sample up to x  0.3. The composition dependence of the specific saturation magnetization and magnetic moment for 0.4 ≤ x ≤ 0.6 were explained on the basis of the existence of Yafet-Kittel angles on the B-site spins. The temperature variation of the initial permeability μi of these samples was carried out from 300 to 900 K. The initial permeability increases with increasing Cd content up to x  0.3 after that it decreases. It was found that Curie temperature Tc decreases from 831 to 697 K.