Solid state reactions in the Fe2O3-CaCO3-In2O3 system

X-ray and differential thermogravimetry in a magnetic field measurements revealed mutual diffusion of the Fe3+ and In3+ ions in the Fe2O3-In2O3 system heat treated for 3 h at 700 to 1400 C. Diffusion of indium into the Fe2O3 lattice lowered the Curie temperature of the antiferromagnetic iron oxide....

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Bibliographic Details
Published in:Journal of materials science 1990-05, Vol.25 (5), p.2353-2358
Main Authors: SZTANISZLAV, A, BALLA, M, FARKAS-JAHNKE, M, NOVAK, C
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
Inorganic chemistry and origins of life
Kinetics and mechanism of reactions
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Summary:X-ray and differential thermogravimetry in a magnetic field measurements revealed mutual diffusion of the Fe3+ and In3+ ions in the Fe2O3-In2O3 system heat treated for 3 h at 700 to 1400 C. Diffusion of indium into the Fe2O3 lattice lowered the Curie temperature of the antiferromagnetic iron oxide. Only CaIn2O4 was found between CaCO3 and In2O3 up to 1400 C. In the Fe2O3-CaCO3-In2O3 system, the reaction started with the mutual diffusion of iron and indium and the forming of CaFe2O4. End-products were the magnetic alpha-Ca4Fe14O25 and CaFe4O7, and the non-magnetic CaFe5O7, depending on the In3+ concentration. Indium stabilised the magnetic calcium-iron oxide structure, lowing their Curie temperatures. 7 refs.
ISSN:0022-2461
1573-4803
DOI:10.1007/BF00638027