MICROSTRUCTURAL AND ELECTROMAGNETIC PROPERTIES OF Mn–Zn FERRITES WITH LOW MELTING-POINT NONMAGNETIC Sb³⁺ IONS

Abstract

The doping effects of low melting-point nonmagnetic Sb 3+ ions on the microstructure and electromagnetic properties of Mn–Zn ferrites were studied. All the samples were prepared by traditional ceramic technique. According to the investigation on the microstructure, it was found that all the samples consisted of ferrite phases with typical spinel cubic structure, and with increasing doping content of Sb 3+ ions, the lattice constant of the ferrites decreased but the grain size increased; the elemental analysis taken on the ferrite grain and grain boundary indicated that a portion of Sb 3+ ions entered into the ferrite lattice. Through the measurement of magnetic properties, it was revealed that, the saturation magnetization and initial permeability of the samples rose with small doping content of Sb 3+ ions but decreased with additional Sb 3+ doping; the Curie temperature decreased monotonously with Sb 3+ doping; and the coercivity rose with increasing doping content of Sb 3+ ions. The analysis of dielectric properties indicated that the dielectric constant of the doped Mn – Zn ferrites increased with increasing doping content of Sb 3+ ions.

A review on MnZn ferrites: Synthesis, characterization and applications

“…The techniques to synthesize MnZn ferrites are shown in figure 6. By doping other elements or oxides [168][169][170][171] the structural, electrical and magnetic properties of MnZn ferrite can be enhanced. For instance, Zaspalis et al [172]observed that there was 17% improvement in the total power loss per volume when doping was done of Nb 2 O 5 in pure MnZn ferrite.…”