Composition of ferrospinel phase and magnetic properties of microspheres and cenospheres from fly ashes

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1016/j.matchemphys.2008.09.061

Ключевые слова: Magnetic materials, Mossbauer spectroscopy, Magnetic materials, Mossbauer spectroscopy, Aluminosilicates, Chemical analysis, Chemical properties, Coal ash, Coal combustion, Combustion, Fly ash, Iron analysis, Iron ores, Iron oxides, Magnetic devices, Magnetic materials, Magnetic properties, Magnetism, Magnetite, Magnets, Microspheres, Molybdenum, Oxide minerals, Saturation magnetization, Silicon compounds, Cenospheres, Defective structures, Iron contents, Magnetic measurements, Magnetic microspheres, Oxide irons, Phase contents, Systematic studies, Magnetic bubbles

Аннотация: The methods of Mossbauer spectroscopy, magnetic measurements, chemical analysis, and thermodynamic calculation of the phase composition were used in systematic studies of oxide iron-aluminosilicate (SiO(2)-Al(2)O(3)-Fe(2)O(3)) system in a wide range of its macrocomponent composition: 0.6-65.6wt.% SiO(2); 0.05-20.5 wt.% Al(2)O(3); 4.6-92.5 wt.% Fe(2)O(3). These correspond to the composition of magnetic microspheres and cenospheres from fly ashes originated from powdered-coal combustion of five varieties of energy coals. It was established that the main phase governing the magnetic properties is magnetite with a defective structure. The microspheres saturation magnetization increases with the iron content range of 4.6-80.0 wt.% Fe(2)O(3) is caused by the increase of the spinet phase content. The magnetization reduction in ferruginous microspheres with the high iron content (83.0-92.5 wt.% Fe(2)O(3)) is the result of the hematite-magnetite displacement. (C) 2008 Elsevier B.V. All rights reserved.

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Издание

Журнал: MATERIALS CHEMISTRY AND PHYSICS

Выпуск журнала: Vol. 114, Is. 1

Номера страниц: 495-503

ISSN журнала: 02540584

Место издания: LAUSANNE

Издатель: ELSEVIER SCIENCE SA

Авторы

  • Bajukov O.A. (Siberian Federal University)
  • Petrov M.I. (Siberian Federal University)
  • Balaev A.D. (L.V. Kirensky Institute of Physics SB RAS, Akademgorodok)
  • Anshits N.N. (Siberian Federal University)
  • Anshits A.G. (Siberian Federal University)

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