Preparation and magnetic characterization of Co2-W strontium hexaferrites doped with Ni and La |
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Authors: | C Stergiou G Litsardakis |
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Institution: | 1. Centre Énergie, Matériaux et Télécommunications, INRS, 1650 Boulevard Lionel-Boulet, Varennes, Québec J3X 1S2, Canada;2. Département de Génie Physique & Regroupement Québécois sur les Matériaux de Pointe (RQMP), Polytechnique Montréal, Montréal, Québec H3T 1J4, Canada |
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Abstract: | The formation and magnetic properties of new Ni- and La-substituted SrCo2-W hexaferrites were investigated. Fabrication of single phase samples required undertaking composition and sintering conditions optimization. This process confirmed the production of W hexaferrites from intermediate cubic and hexagonal ferrite phases and additionally proved the enhancement of final purity by the excessive hexagonal component. Furthermore, according to the X-ray diffraction analysis, pure Ni- or La-doped compounds were formed in most cases, which actually necessitated more intense heat treatment (1225–1250 °C). Yet, magnetic measurements interestingly reveal that substances with low substitution possess high saturation magnetization (~72–75 Am2/kg) and unexpectedly lower coercivity (~28–46 Oe), compared to the undoped one. This behavior is attributed to the chemistry of both substitutions, inducing the magnetic order variation and the anisotropy transition from in-plane to axial. Thus, a scarcely elaborated transient compositional region with planar anisotropy and strong magnetization is discerned, highlighting the potential of these soft ferrites. |
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