Abstract
Magnetic spheres of various origins, isolated from fly ashes of the main Russian thermal coals, have been studied by electron microscopy, optical microscopy, X-ray diffraction, and Mössbauer spectroscopy. The magnetic spheres differ in morphology and have the form of multilevel core-shell nanocomposites, with a hematite or spinel Fe-rich core and a Fe-containing silicate glass shell. We have derived structural formulas of the spinels, which are consistent with all our experimental data. The most promising application fields of such magnetic spheres, after proper selection and modification, are catalysis and composites.
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Original Russian Text © V.V. Zyryanov, S.A. Petrov, A.A. Matvienko, 2010, published in Neorganicheskie Materialy, 2010, Vol. 46, No. 6, pp. 729–737.
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Zyryanov, V.V., Petrov, S.A. & Matvienko, A.A. Morphology and structure of magnetic spheres based on hematite or spinel and glass. Inorg Mater 46, 651–659 (2010). https://doi.org/10.1134/S0020168510060166
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DOI: https://doi.org/10.1134/S0020168510060166