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Mössbauer effect study of the Β-FeOOH to α-Fe2O3 phase transformation

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Abstract

Β-FeOOH was precipitated from a chloride solution. Mössbauer spectra were taken at room temperature (RT) and at 4.2 K in zero field and in external magnetic fields. Samples aged for successively longer time periods were studied. They contain α-FeOOH and α-Fe2O3, the Mössbauer spectra of which show superparamagnetic behavior. The transformation into α-Fe2O3 is already induced by aging in the mother solution at 100 ‡C. A final heat treatment at 350 ‡C leads to the complete transformation into α-Fe2O3 and to an increase of the crystallite size.

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Authors and Affiliations

  1. Department of Physics, Leipzig University, Linnéstrasse 5, 04103, Leipzig, Germany

    K. Knese, P. Wartewig & C. Michalk

  2. Institute of Inorganic Chemistry, Technical University, Mommsenstrasse 13, 01069, Dresden, Germany

    S. Fischer

Authors
  1. K. Knese
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  2. P. Wartewig
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  3. C. Michalk
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  4. S. Fischer
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Knese, K., Wartewig, P., Michalk, C. et al. Mössbauer effect study of the Β-FeOOH to α-Fe2O3 phase transformation. Hyperfine Interact 94, 1999–2004 (1994). https://doi.org/10.1007/BF02063730

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