Effect of milling in various media and annealing on the structure and magnetic properties of strontium hexaferrite powder

S. V. Ketov, E. A. Lopatina, T. A. Bulatov, Yu D. Yagodkin, V. P. Menushenkov

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    3 Citations (Scopus)

    Abstract

    In the present work, the structure and magnetic properties of strontium hexaferrite powder during milling in various media and subsequent annealing were studied. The milling of the powder leads to an abrupt decrease in the powder particle size and the average crystallite sizes as well as an increase in lattice microstrains of the SrFe12O19 phase. During milling in toluene, no changes in the phase composition were observed, whereas, during milling in water, the Fe2O3 phase (type H1.1) is formed. In the powder milled in oleic-acid-containing toluene a small quantity of α-Fe was found. After milling, the saturation magnetization and remanence decrease; at the same time, the coercive force of the powder milled in toluene is unchanged with increasing milling time, but slightly increases after milling in water and in oleic-acid-containing toluene. The annealing allowed us to increase the magnetic properties of the powder. It is conditioned by formation of nanocrystalline state. Moreover, the magnetic properties values depend on the medium and time of milling. The annealed powders are characterized by the following magnetic properties: μ0Hci = 0.42 ÷ 0.49 T, Br = 0.23 ÷ 0.24 T, (BH)max= 8-9.6 kJ/m3.

    Original languageEnglish
    Title of host publicationMagnetism and Magnetic Materials V
    PublisherTrans Tech Publications Ltd
    Pages183-187
    Number of pages5
    ISBN (Print)9783037854365
    DOIs
    Publication statusPublished - 2012
    Event5th Moscow International Symposium on Magnetism, MISM 2011 - Moscow, Russian Federation
    Duration: 2011 Aug 212011 Aug 25

    Publication series

    NameSolid State Phenomena
    Volume190
    ISSN (Print)1012-0394

    Other

    Other5th Moscow International Symposium on Magnetism, MISM 2011
    Country/TerritoryRussian Federation
    CityMoscow
    Period11/8/2111/8/25

    Keywords

    • Hard magnetic material
    • Nanocrystalline structure
    • Strontium hexaferrite

    ASJC Scopus subject areas

    • Atomic and Molecular Physics, and Optics
    • Materials Science(all)
    • Condensed Matter Physics

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