Effects of Zn Substitution on the Dispersion Spectrum of Permeability and Permittivity of Cu-Mn Ferrites in 1 MHz - 1 GHz Frequency Range

Abstract

This work presents a study of Mn-Zn-Cu triphasic spinel ferrite according to Stoichiometry Cu_(0.5-β) Zn_β Mn_0.5 Fe₂O₄ with β = 0.10, 0.20, 0.30 and 0.40 . The samples were produced by the conventional ceramic method of sintering, irrigated with partial oxygen pressure, following a determined thermal curve. The morphological, microstructural, dielectric and magnetic properties were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive Spectroscopy (EDS) analysis and impedance measurements. The data obtained demonstrated the influence of stoichiometry on the dimensional morphological variation, density, grain size, and electromagnetic behavior in the proposed frequency range. Electromagnetic analysis revealed electrical (ε*) and magnetic (μ*) behaviors very similar to an almost linear decrease of the real and imaginary parts with the increase of frequency, with some oscillations in several parts of the curve, according to the different β. Thus, for the ferrites produced by the conventional ceramic method of powders oxides sintering, irrigated with partial oxygen pressure, within a determined thermal curve, we observed an important relationship between the different triphasic stoichiometric combinations of Mn-Zn-Cu, according to the different β, with their volume, density, grain size, and electromagnetic response in the frequency range from 1.0 MHz to 1GHz.

Keywords:
Ceramics Processing; Electromagnetic Properties; Electronic Materials; Manganese Copper Zinc Ferrites