INVESTIGATION ON MAGNETIC PROPERTIES AND CURIE TEMPERATURE OF SAMARIUM MODIFIED COBALT FERRITE

Samarium substituted cobalt ferrite CoFe2-xSmxO4 with concentration of x = 0, 0.05 and 0.15 were prepared using conventional solid-state ceramic method. Prepared samples first calcined at 900C for 4 hours and then sintered at 1150 C for 4 hours. The X-Ray powder diffraction data analysed to identify the phases present in the crystalline ceramic. An additional phase of Sm-Fe-O was observed for the sample at x = 0.15. Lattice parameter, strain and saturation magnetization found to be decreasing whereas crystallite size and coercivity found to be vary with samarium content. Decrease of Curie temperature attributed to the decrease of exchange interaction among tetrahedral or octahedral ions due to samarium content.