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Susceptibility and curie temperature study in Cr3+ substituted Mg- Cd ferrites

S.A.Mastic

Temperature dependence normalized AC susceptibility and Curie temperature of spinel ferrites CdxMg1-xFe2-yCryO4 (x=0, 0.2, 0.4, 0.8 and 1.0; y=0, 0.05 and 0.1) study reveals that MgFe2O4 exibits multi domain (MD) structure with high Curie temperature On substitution of Cd2+,MDto Single Domain (SD) trasitions takes place and Curie temperature decreases due to decrease inA-B intraction. On substitution of Cr3+ inMg-Cd ferrite system peak obtained in MgFe2O4 is supressed which is attributed to decrease in grain size and further decrease in Curie temperature is attributed to the decrease in B-B interaction. This is because Fe-Fe interaction is greater than Cr-Fe interaction at B-site