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Solid state reactions in the Fe2O3-CaCO3-In2O3 system

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Abstract

The kinetics of solid-state reactions of powdered reactants were investigated by X-ray and by 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 caused a shift of the Curie temperature of the antiferromagnetic iron oxide towards lower temperatures. Only Caln2O4 was found between CaCO3 and In2O3 up to 1400° C. Also, in the Fe2O3-CaCO3-In2O3in system, the reaction started with the mutual diffusion of iron and indium and the forming of CaFe2O4. End-products were the magnetic α-Ca4Fe14O25 and CaFe4O7, and the non-magnetic CaFe5O7, depending on the In3+ concentration. Indium stabilized the magnetic calcium-iron oxide structures, shifting their Curie temperatures towards lower values.

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Authors and Affiliations

  1. Research Institute for Telecommunications, POB 76, H-1325, Budapest, Hungary

    Anna Sztaniszlav & Magdolna Balla

  2. Research Institute for Technical Physics of the Hungarian Academy of Sciences, Fóti út 56, H-1047, Budapest, Hungary

    Maria Farkas-Jahnke

  3. Institute for General and Analytical Chemistry of the Technical University, Gellért tér 4, H-1502, Budapest, Hungary

    Csaba Novák

Authors
  1. Anna Sztaniszlav
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  2. Magdolna Balla
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  3. Maria Farkas-Jahnke
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  4. Csaba Novák
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Sztaniszlav, A., Balla, M., Farkas-Jahnke, M. et al. Solid state reactions in the Fe2O3-CaCO3-In2O3 system. J Mater Sci 25, 2353–2358 (1990). https://doi.org/10.1007/BF00638027

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  • DOI: https://doi.org/10.1007/BF00638027

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