Preparation and Characterization of Mn_0.4Ni_<i>x</i>Zn_{0.6−<i>x</i>}Fe₂O₄ Soft Spinel Ferrites for Low and High Frequency Applications by Citrate Precursor Method

Abstract

In the present study, preparation and characterization of Mn-Ni-Zn soft ferrites with chemical formula Mn 0.4 Ni x Zn 0.6− x Fe 2 O 4 , where x = 0.0, 0.2 and 0.4, by citrate precursor method has been reported. Microstructural properties studied with the help of X-ray diffraction and scanning electron microscopy show that the samples have almost uniform sized crystallites and have single phase spinel structure. The properties like initial permeability, permeability loss, dielectric constant, dielectric loss are studied as a function of frequency. The d.c. resistivity of the samples is also studied. Variation of d.c. resistivity with composition, x , of the ferrite sample shows that pure zinc ferrite has more resistivity than that of nickel substituted zinc ferrite. The dispersion in the magnetic and electrical properties has been discussed by using various mechanisms, models and theories.