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ArticleName Structure and Magnetic Properties of Strontium Hexaferrite Powder After Milling in Water and Toluene and Following Annealing
ArticleAuthor T. A. Bulatov, S. V. Ketov, V. P. Menushenkov, Yu. D. Yagodkin

National University of Science and Technology MISiS:

T. A. Bulatov

S. V. Ketov

V. P. Menushenkov

Yu. D. Yagodkin


Structural changes of strontium hexaferrite powders after milling in water and toluene and after subsequent annealing were studied using X−ray diffraction, Scanning Electron Microscopy and Laser diffraction. Also magnetic properties changes were studied. The coarse−grain powder milling leads to an abrupt decrease of its particles size and the average crystallite size as well as an increase of SrFe12O19 phase lattice microstrains. Saturation magnetization and remanence decrease after milling in both media. At the same time coercive force of milled powders changes insignificantly with increasing milling time. The subsequent annealing allowed us to increase the magnetic properties of the powder. The annealed powders are characterized by the following magnetic properties: μ0Нci = 0,42÷0,49 T, μ0Ir = 0,23÷0,24 T, (BH)max = 8−9,6 kJ/m3.

keywords Strontium hexaferrite, magnetic materials, nanomaterials, milling, powder metallurgy, x−ray diffraction analysis, scanning electron microscopy

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