Analysis of Dielectric and Resistive Properties of Sn Substitution in Ni-Zn Ferrites Nanoparticles

Abstract

Ni-Zn Ferrites samples were prepared by solid state reaction method by introducing Sn. Polycrystalline samples were molded following this combination Ni0.6-x/2Zn0.4-x/2SnxFe2O4 (0 ≤ x ≤0.2) and sintered at temperature 1325C for 180 minutes. The structural, magnetic and transport properties of various ferrite samples were studied with the Sn substitution. XRD patterns indicate that the synthesized ferrite compositions were of single phase cubic spinel without any trace of impurity. Lattice parameter of the samples was found to decrease with increasing Sn concentration in the system obeying Vegard’s law. Dielectric constant decreased with the increase of frequency which is rapid at lower and slower at higher frequencies. This is a normal dielectric behavior in most of the ferromagnetic materials, which follow Maxwell and Wagner prediction. With the increase of temperature, dielectric constant and dielectric loss tangent are observed to be increased. The AC electrical resistivity, measured as a function of temperature, decreases with the increase of temperature indicating the semiconducting nature of all the samples. The activation energy of the all samples were calculated from the plot of ln(/0) vs.1/T curve. The lower activation energies are associated with higher electrical conductivity.