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

被引：29

作者：

Bajukov, O. A. ^{[1
,3
]}

Anshits, N. N. ^{[2
,3
]}

Petrov, M. I. ^{[1
,3
]}

Balaev, A. D. ^{[1
]}

Anshits, A. G. ^{[2
,3
]}

机构：

[1] RAS, LV Kirensky Phys Inst SB, Krasnoyarsk 660036, Russia

[2] RAS, Inst Chem & Chem Technol SB, Krasnoyarsk 660049, Russia

[3] Siberian Fed Univ, Krasnoyarsk 660074, Russia

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2009年 / 114卷 / 01期

关键词：

Magnetic materials; Mossbauer spectroscopy; GLASS CRYSTAL CATALYSTS; CONVERSION; OXIDATION; MODEL;

D O I：

10.1016/j.matchemphys.2008.09.061

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (SiO2-Al2O3-Fe2O3) system in a wide range of its macrocomponent composition: 0.6-65.6wt.% SiO2; 0.05-20.5 wt.% Al2O3; 4.6-92.5 wt.% Fe2O3. 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.% Fe2O3 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.% Fe2O3) is the result of the hematite-magnetite displacement. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：495 / 503

页数：9

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