Abstract

• Magnesium doped Nickel-Copper-Zinc ferrites with the general formula Ni0.6-xMgxCu0.2 Zn0.2Fe2O4 (where x = 0.0 – 0.6 with the step of 0.2) were prepared by solid state reaction method. The samples were characterized by X-ray Diffractometry (XRD), Scanning Electron Microscopy (SEM) and temperature dependent electrical conductivity measurement. XRD confirmed the presence of spinel phase cubic crystalline as major phase of the as-prepared samples. The lattice parameters and average crystallite sizes of the samples were investigated from the observed XRD patterns. The samples were made into pellets and the temperature dependent dc electrical conductivities were studied by using two-probe method. Electrical conduction mechanism and the activation energy were studied. The obtained electrical conductivity results reveal that the samples (x = 0.0, 0.2 and 0.4) were normal ionic conductors and the sample x = 0.6 was superionic conductor at high temperature.