CRYSTALLOGRAPHIC AND ELECTRICAL RESISTIVITY STUDY OF CR3+ SUBSTITUTED MG-CD FERRITES FOR LOW LOSS POWER DEVICES

Polycrystalline spinel ferrites were prepared by standard ceramic method. X-ray diffraction method used for characterization of the samples. Crystallographic parameters were calculated and are used to correlate the property of resistivity. Crystallographic study shows that in substituted Mg ferrites, Cd2+ resides at A-sites while Cr3+ occupies at B-sites. Study of the electrical resistivity shows that all the samples have semiconductor behavior. On substitution of Cd2+ activation energy of MgFe2O4 decreases while it increases with substitution of Cr3+ions. These changes were attributed to variation of the number of iron ions at B-sites. Lorria-Sinha Method was also employed to determine Curie temperature of the samples.