Effect of Cr3+ substitution on magnetic and electrical properties of (Ni0.3Cu0.7) Fe2O4 spinel ferrites

Abstract

Chromium substituted copper base spinel ferrites (Ni0.3Cu0.7)CrxFe2-xO4 were prepared by Sol-gel method. Structural, magnetic and electrical properties were studied by utilizing X-ray diffractometer, Vibrating sample magnetometer, and precision LCR-meter using lab-tracer software. The X-ray diffraction analysis confirmed the formation of single phase fcc structure of the samples. The lattice constant and crystallite size decreased from 8.37-8.23Å and 53.09-35.36nm respectively with increasing content of Cr3+ ions. From MH loops it was observed that the saturation magnetization decreased and coercivity increased with increasing content of Cr3+ ions. Dc resistivity increased with increase of Cr3+ concentration and decreased with increase in temperature which shows the semiconducting behavior of ferrites. The dielectric constant, dielectric loss and tangent loss decreased with increase of Cr3+ concentration. The dielectric constant follows bilayer Maxwell Wagner model and Koop’s phenomenological theory while ac conductivity increased with increasing frequency following Jonscher’s power law.

Tuning Photocatalytic Efficiency through Cu Doping in Ni-Zn Ferrite Nanoparticles: Structural and Optical Characteristics

“…As the photocatalytic reaction progresses, the absorbance at this wavelength decreases, indicating the degradation and breakdown of the organic pollutant. To quantitatively assess the degradation rate, the ratio between the residual concentration of the dye and the initial concentration (C/C0) is calculated [17]. This ratio provides a measure of how quickly the organic dye pollutant degrades over time.…”