Resumen

BASHIR, K. et al. Effect of Cr³⁺ substitution on magnetic and electrical properties of (Ni_0.3 Cu_0.7) Fe₂O₄ spinel ferrites. Rev. mex. fis. [online]. 2020, vol.66, n.5, pp.573-579.  Epub 31-Ene-2022. ISSN 0035-001X.  https://doi.org/10.31349/revmexfis.66.573.

Chromium substituted copper base spinel ferrites (Ni 0.3 Cu 0.7 )Cr X Fe2− X O4 were prepared by Sol-gel method. Structural, magnetic and electrical properties were studied by utilizing an X-ray diffractometer, vibrating-sample magnetometer, and precision LCR-meter using labtracer 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 8.37-8.23 Å and 53.09-35.36 nm, respectively with increasing content of Cr3+ ions. From Magnetization Vs Applied field 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.

Palabras llave : Ferrites; sol gel; XRD; Dielectric constant; electrical resistivity; magnetic properties.

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