Composition of individual ferrospheres of different morphological types | Научно-инновационный портал СФУ

Composition of individual ferrospheres of different morphological types

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1134/S0020168515110114

Ключевые слова: Atoms, Ferrite, Hematite, Iron oxides, Oxidation, Atomic ratio, Crystalline spinels, Degree of oxidations, Dendritic spheres, High calciums, Plate-like structure, Size fraction, Spinel ferrites, Spheres

Аннотация: We have studied the composition of three types of individual spheres differing in microstructure (single-block, platelike, and skeletal-dendritic spheres) in the-40 + 32 mu m size fraction of ferrospheres containing 92.72 wt % FeO. The results demonstrate that the single-block spheres have the highest Fe content (95-97% FeO), a basicity factor M (b) > 48, and an Fe/O atomic ratio of 0.68-0.71. They consist of block individuals of a partially martitized (oxidized to hematite) spinel ferrite. The platelike spheres feature high calcium content (11-12% CaO); lower basicity factor, M (b) a parts per thousand integral 20-21; and a higher degree of oxidation of Fe, with an Fe/O atomic ratio of 0.63-0.66. They consist of spinel ferrite blocks with large percentages of FeO (up to 90%) and MgO (up to 6%), surrounded by regions with a platelike structure, reduced FeO content (down to 57%), and high CaO content (up to 34%). The skeletal-dendritic spheres feature increased percentages of SiO2 (a parts per thousand integral 4.7 %) and Al2O3 (3.6-4.6%) and low basicity factor: M (b) a parts per thousand integral 10-11. They consist of unidirectional or branched crystalline spinel ferrite individuals with partial Mg2+ substitution for Fe2+, which prevents oxidation of the spinel to hematite, as evidenced by the large Fe/O atomic ratio: 0.72-0.73.

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Издание

Журнал: INORGANIC MATERIALS

Выпуск журнала: Vol. 51, Is. 11

Номера страниц: 1143-1150

ISSN журнала: 00201685

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Sharonova O.M. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Fedorchak M.A. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Zhizhaev A.M. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Mazurova E.V. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Anshits A.G. (Siberian Federal University)

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