Microstructure, Magnetic, and Gyromagnetic Properties of Nb5+ Ion Substituted Liznti Ferrites

Abstract

In this work, a systematic study of the influence of niobium pentoxide (Nb2O5) substitution on the crystal structure, morphological characteristics, and magnetic parameters of LiZnTi ferrites is presented. The Nb2O5 substituted LiZnTi ferrites (Li0.43+xZn0.27Ti0.13NbxFe2.17-2xO4, 0 ≤ x ≤ 0.08) were synthesized through solid-phase sintering process. XRD results reveal the presence of a single spinel structure (space group Fd[[EQUATION]]m) for all samples, signifying that Nb2O5 substitution has no effect on the phase structure of LiZnTi ferrites. SEM images show that the ferrites possess uniform and compact grains, which indicates the Nb5+ ion substitution does not deteriorate the microstructure. Regarding to the magnetic properties, the saturation magnetization (4πMs) of the samples decreased from 3999 Gs to 3833 Gs, the coercivity (Hc) decreased from 331.7 A/m to 303.4 A/m, and the ferromagnetic resonance linewidth (ΔH) decreased from 404 Oe to 337 Oe with Nb5+ substitution. As a result, we demonstrated that appropriate substitution of Nb5+ ions for Fe3+ could significantly optimize the microstructure and magnetic properties of LiZnTi ferrites.

Keywords: Nb2O5, LiZnTi ferrites, FMR linewidth, Magnetic properties