Abstract

In this study, we report the influence of Ga content on the microstructural, magnetic, and AC impedance properties of Co-based ferrites with compositions of CoMn0.2−xGaxFe1.8O4 (x=0, 0.1, and 0.2) prepared by the solid-state reaction method. Experimental results showed that the as-prepared Co-based ferrites had a single-phase spinel structure; the Curie temperature of Co-based ferrites decreased with increasing Ga content. All ferrite samples exhibited a typical hysteresis behavior with good values of saturation magnetization at room temperature. The electrical properties of Co-based ferrites were investigated using complex impedance spectroscopy analysis in the frequency range of 100 kHz-50 MHz at temperatures of 150 to 250 oC. The impedance analysis revealed that the magnitudes of the real part (Z’) and the imaginary part (Z”) of complex impedance decreased with increasing temperature. Only one semicircle was observed in each complex impedance plane plot, which revealed that the contribution to conductivity was from the grain boundaries. It was found that the relaxation time for the grain boundary (τgb) also decreased with increasing temperature. The values of resistance for the grain boundary (Rgb) significantly increased with increasing Ga content, which indicated that the incorporation of Ga into Co-based ferrites enhanced the electrical resistivity.

Highlights

  • Spinel ferrites exhibit high resistivity, low eddy-current loss, and low dielectric loss, making them suitable for applications in the electronics and telecommunications industries such as transformers, magnetic switches, computer memory media, and microwave devices.[1]

  • Experimental results showed that the as-prepared Co-based ferrites had a single-phase spinel structure; the Curie temperature of Co-based ferrites decreased with increasing Ga content

  • The average particle size of each ferrite sample was determined by the mean linear intercept, which was determined from scanning electron microscope (SEM) micrographs

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Summary

INTRODUCTION

Spinel ferrites exhibit high resistivity, low eddy-current loss, and low dielectric loss, making them suitable for applications in the electronics and telecommunications industries such as transformers, magnetic switches, computer memory media, and microwave devices.[1]. Few studies on the electrical transport characterization of Co-based ferrites are available in the literature. This lack of information motivated us to study the effects of Ga content on the microstructural features, magnetic properties, and AC impedance characteristics of CoMn0.2−xGaxFe1.8O4 ferrites

EXPERIMENTAL SECTION
RESULTS AND DISCUSSION
CONCLUSIONS
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