STRUCTURAL AND ELECTRICAL PROPERTIES OF MAGNESIUM-DOPED CoFe₂O₄

Abstract

In this paper, magnesium-doped CoFe₂O₄ (Co_0.5Mg_0.5Fe₂O₄) compound was synthesized by a solid-state reaction route. The impact of Mg inclusion on the structural parameters of the obtained compound and the subsequent development of thermally-assisted electro-active areas has been systematically examined, as this compound has a fit composition for doping at the site of Co due to its relevantly equal atomic radius. Also, Mg was established as highly ferroelectric and low-weight material. The compound structure and microstructure have been analyzed using the method of scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis. The dielectric properties were studied over a broad spectrum of frequency and temperature, and quite low dielectric loss was recorded. In the context of impedance and conductivity formalism, frequency-dependent electrical information has been evaluated at varying temperatures. The Nyquist plot represents the effect of grain and grain boundary. Thermally activated non-Debye type relaxation processes were observed in the composites. Jonscher universal power law follows the frequency-dependent AC conductivity at different temperatures. Temperature dependence of AC conductivity at various frequencies indicates a negative temperature coefficient of resistance (NTCR) behavior. Estimating the magnitudes of activation energies in different temperature ranges enables defining the nature of the species involved in the conduction system.