Effect of indium substitution on the electrical and magnetic properties of Ni–Zn ferrite

B B V S Vara Prasad

doi:10.1007/s40094-015-0185-5

Abstract

Indium-substituted polycrystalline nickel zinc ferrites of different compositions Ni0.65Zn0.35Fe2−x In x O4 (x = 0.00, 0.04, 0.08, 0.12, 0.16, 0.2) have been prepared by solid-state reaction route. Calcination and sintering of all samples were done in air atmosphere at 950 °C and 1250 °C, respectively, followed by natural cooling to room temperature. Characterization of the basic composition was done by X-ray diffractometry, saturation magnetization and Curie temperature. The effect of incorporation of larger indium ions in place of iron was studied with the help of saturation magnetization, Curie temperature, permeability, magnetic loss factor, DC electrical resistivity and dielectric properties. The highest magnetization and permeability values of the present system under study are 74.1 emu/g and 438 for the basic composition (concentration x = 0). The DC electrical resistivity was found to decrease up to x = 0.3 and increase thereafter. The variation in the electric and magnetic properties of this ferrite system is dominated by the decrease in iron concentration. Characteristic high dielectric constant values were recorded for these bulk ceramic materials.

Highlights

Polycrystalline spinel ferrites are extensively investigated for their usefulness in modern technology
X-ray diffraction patterns of all the indium-substituted nickel–zinc ferrite samples have the standard planes (220), (311), (222), (400), (422), (511), (440) and (533), as well as no detectable additional peaks, which confirm the formation of single phase cubic spinel structure
Iron ions are less available for hopping, the electron is obstructed by larger indium ions in B site and the electrons/ions cannot follow the field resulting in a decrease of dielectric constant

Summary

Introduction

Polycrystalline spinel ferrites are extensively investigated for their usefulness in modern technology. Keywords Ni–Zn ferrite Á Magnetization Á Curie temperature Á DC electrical resistivity Á Indium & B. Previous research study of indium-substituted nickel–zinc ferrite systems in bulk form showed some interesting variations in the electric and magnetic properties [7,8,9,10].

Results

Conclusion