Magnetic and dielectric properties of cadmium substituted nickel cobalt nanoferrites

Nano particles of CdXNi(0.5-X)Co0.5Fe2O4 (x = 0.0, 0.1, 0.2 and 0.3) were prepared by coprecipitation method. The lattice constant and distribution of cation in A-site and B-site have been deduced through X-ray diffraction (XRD) data analysis. The lattice constant (C-0) was found to increase with increase in Cd2+ concentration in the spinel structure of Ni-Co ferrites. The saturation magnetization was found to decrease with increase in Cd concentration for all the samples. It is observed that the Curie temperature (T-c) is higher than in bulk counterpart. The dielectric constant increases with increase in Cd concentration. This increase in dielectric constant is attributed to the formation of Fe3+ ion in the octahedral site which increases the hopping between Fe3+ and Fe2+.