Effect of Dy substitution on the structural, electrical and magnetic properties of Mg0.4Cu0.2Zn0.4Fe2O4 Ferrites

Abstract

Structural, electrical and magnetic properties of Mg0.4Cu0.2Zn0.4DyxFe2-xO4 ferrites (where x = 0.0, 0.01, 0.02, 0.03 and 0.04) prepared by the solid state reaction technique had been observed in this study. The x-ray diffraction patterns confirmed the single phase cubic spinel structure up to x = 0.02. However, a small peak of DyFeO3 was coexisting with the cubic spinel structure for x > 0.02. Fourier transforms infrared absorption bands revealed that the frequency band appeared in the high frequency (548-555 cm-1) which was attributed to the stretching vibrations, while the band appeared in the low frequency (352 - 355 cm-1) which was related to bending vibrations. The values of saturation magnetizations for Dy substituted Mg-Cu-Zn ferrites were observed from the hysteresis loop and it was reduced from 56.65 (for x = 0.0) to 51.93 emu/g (for x = 0.04). The real part of the initial complex permeability (μ_i^') was found larger for x = 0.02 which could be ascribed to the densification of the sample along with the larger grain size. The dielectric property of the samples showed dispersive behavior following the Maxwell-Wagner type of polarization. The Cole-Cole plot had shown a single semicircular arc for x ≤ 0.03, which indicates that the conduction mechanism occurred through the grain effect.