Structural and magnetic properties of lightly doped M-type hexaferrites

TL;DR

This study investigates the effects of vanadium and europium substitutions on the structural and magnetic properties of M-type hexaferrites, revealing phase coexistence and potential for practical applications despite some property deterioration.

Contribution

It introduces new substitution methods for hexaferrites and analyzes their phase composition and magnetic properties, offering insights for improved material synthesis.

Findings

V substitution causes phase separation with nonmagnetic vanadate and iron oxide phases.

Eu substitution results in phase coexistence with garnet and iron oxide phases.

Magnetic properties deteriorate but remain useful for applications.

Abstract

Vanadium substituted SrM hexaferrites (SrFe12-xVxO19 with x = 0.2, 0.4) and Eu-substituted BaM hexaferrite (Ba0.8Eu0.2Fe12O19) were prepared by high energy ball milling and sintering at 1200{\deg} C. X-ray diffraction measurements revealed that the V-substituted SrM samples exhibited phase separation resulting in the coexistence of the pure SrM magnetic phase with nonmagnetic Sr3(VO4)2 vanadate and {\alpha}-Fe2O3 iron oxide phase. Also, the Eu-substituted BaM hexaferrite revealed the formation of the pure BaM phase coexisting with {\alpha}-Fe2O3 secondary phase, and Eu-garnet minor phase. Although the magnetic properties of the samples deteriorated with respect to pure hexaferrite properties, the magnetic parameters of the substituted samples were found to be of potential importance for practical applications. Further, the results of the study suggest methods for the preparation of high quality SrM hexaferrites, and hexaferrite/garnet composites.