Dielectric Response of Nix Zn1-x Al Fe O4 Nanoferrites

Paramesh Donta, Vijaya Kumar Katrapally and Venkat Reddy Pendyala


Ni-Zn-Al nanoferrites of general formula Nix Zn1-x Al Fe O4 (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) were synthesized by sol-gel auto combustion technique. The X-ray diffraction and FTIR studies confirmed the formation of single cubic spinel structure. Dielectric performance and AC conductivity of prepared mixed nanoferrites were carried out using LCR impedance meter. It was observed that both dielectric constant and dielectric loss were decreased by increasing the frequency whereas AC conductivity increases with applied frequency but decreases with increasing the Ni2+ ion substitution for a fixed Al3+ ion concentration. DC resistivity, activation energy and Curie temperature were calculated by using the two probe experimental method. It was observed that DC resistivity decreased whereas the charge mobility increased with increasing the temperature. DC resistivity and activation energy of the nanoferrite samples were increased with Ni2+ ion substitution for a fixed Al3+ ion concentration.