Structural, Magnetic and Dielectric Investigation of Cr Doped Co

Structural, Magnetic and Dielectric Investigation of Cr Doped Co–Zn Nanoferrites

Kaur, Harpreet / Ahlawat, Dharamvir Singh / Tyagi, Anand Kumar

Cobalt zinc ferrites which have been doped with chromium Co_0.4Zn_0.6Cr_xFe_2−xO₄ (x = 0.05, 0.10, 0.15, 0.20) denote as CZC-nanoferrites are prepared by auto-combustion method. The magnetic and dielectric characteristics of Co–Zn nanoferrites were improved by Cr³⁺ doping. Analysis using XRD, FTIR, and FESEM reveals the cubic spinel phase for CZC nanoferrites. The lattice constant first rises for x = 0.10 and then falls with increasing x for x > 0.10. The ferrite samples having cluster form with spherical shape, as seen by the FESEM results. The Cr³⁺ concentration determines the modifications in magnetic properties of samples. Coercivity (H_c) reduces when Cr–Zn concentration rises. For all samples, the frequency-dependent evaluation of the dielectric behaviour is understood by determining the dielectric loss and constant along with ac-conductivity. The dielectric analysis showed that, possibly as a result of space charge polarization, the dielectric constant and loss tangent have been observed to decrease by frequency increase. The conduction of ferrite samples is influenced by grain boundaries. High frequency devices and recording media may be highly benefited by using these nanostructured ferrites. The work reported in this article is an attempt to introduce the least explored Cr³⁺ doped CoZnFe₂O₄ and to explore its potentiality for different properties in a single material.

Graphical Abstract

The lattice constant then came down for x = 0.15 and then increased once again at x = 0.20. Thus ferrite system has this nonlinear phenomenon. The peak intensity varies with the Cr³⁺ addition in the cobalt zinc ferrite in FTIR plot. The value of saturation magnetization lowers at x = 0.10 and then increases may be caused by the canted spin instead of parallel.