Structure and magnetic properties of Mg0.35Cu0.2Zn0.45Fe2O4 ferrite synthesized by co-precipitation method

Bo Yang,Zhi Wang

doi:10.1063/1.4978658

Abstract

Mg0.35Cu0.2Zn0.45Fe2O4 nanosize particles have been synthesized by chemical co-precipitation method and characterized by X-ray diffraction (XRD) and vibrating sample magnetometry (VSM). The XRD patterns confirmed the single phase spinel structure of the synthesized powder. The average crystallite size of the powder varied from 14 to 55 nm by changing annealing temperature. The activation energy for crystal growth was estimated as about 18.61KJ/mol. With the annealing temperature increasing, saturation magnetization (MS) was successively increased while the coercivity (HC) was first increased, passed through a maximum and then declined. The sintering temperature has significant influence on bulk density, initial permeability and Curie temperature of Mg0.35Cu0.2Zn0.45Fe2O4 ferrite.

Highlights

Magnetic nanoparticles of mixed spinel ferrites have been the subject of current interest because of their interesting magnetic, electric, dielectric and optical properties, which are considerably different from that of their bulk counterparts.[1,2,3] These systems are commercially important for their several applications in electromagnetic devices operated in the radio frequency region.[4,5,6] Nanoparticles of these materials exhibit interesting phase transitions from superparamagnetic to ferri-magnetic state or vice versa with variation of temperatures depending on their sizes.[7]
The X-ray diffraction (XRD) patterns show that the peaks become narrower and sharper with the
Nanoparticles of Mg0.35Cu0.2Zn0.45Fe2O4 ferrite were prepared by the chemical co-precipitation method

Summary

INTRODUCTION

Magnetic nanoparticles of mixed spinel ferrites have been the subject of current interest because of their interesting magnetic, electric, dielectric and optical properties, which are considerably different from that of their bulk counterparts.[1,2,3] These systems are commercially important for their several applications in electromagnetic devices operated in the radio frequency region.[4,5,6] Nanoparticles of these materials exhibit interesting phase transitions from superparamagnetic to ferri-magnetic state or vice versa with variation of temperatures depending on their sizes.[7]. To achieve superparamagnetic properties with relatively large size, the factors can be systematically varied, in the case of mixed spinel ferrites. Zinc cations dilute the magnetical system by making the A-B exchange interaction relatively weaker This weaker coupling reduces the anisotropy energy of the system, which facilitates the onset of superparamagnetic relaxation in bigger size particles even at room temperature. There are many methods that can be used to obtain the ferrite nanoparticles.[13,14,15,16,17] Of all these techniques, chemical co-precipitation seems to be the most convenient for the synthesis of nanoparticles because of its simplicity and better control over crystallite size and other properties of the materials. Mg0.35Cu0.2Zn0.45Fe2O4 ferrite was synthesized by the chemical coprecipitation method, the structural and magnetic characterization of low annealing temperature powders and sintered materials were investigated

EXPERIMENTAL

RESULTS AND DISCUSSION

CONCLUSION