Effect of cadmium doping on structural and magnetic studies of Co-Ni ferrites

We report effect of influence of Cd2+ ions on Co-Ni ferrites synthesized by the solid state reaction method. The X-ray diffraction analysis confirmed the cubic spinel phase with crystallite size varies between 20-24 nm. The SEM images show tetrahedral, octahedral, granular, long bulgy structures with variety of sizes. The Raman spectra for samples with x = 0.1 and x = 0.4 shown peaks corresponding to Alg, Eg and T2g which very closely match with NiFe2O4 spectra with slight variation in peak position as an effect of different chemical formula. Magnetic measurements were carried out at room temperature. It is found that substitution influenced the magnetic properties. Saturation magnetization decreased from 52.74 to 32.68 emu.gm-1 and coercivity shown an initial increase and then a continuous decrease, with increase in the Cd2+ substitution. Retentivity is found to be varying between 10.1 emu/gr - 6.21 emu/gr