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The Mechanism of the Thermal Transformation From Goethite to Hematite

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Abstract

Synthetic pigments of goethite (BayferroxR) of different particle size were investigated by DTA, IR, DSC, TG and X-ray diffraction measurements. It follows that a so-called ‘hydrohematite’ described in the literature does not exist as a discrete intermediate during the dehydration course from goethite to hematite. Instead we observed a dependence of the dehydration mechanism on the particle size. Transformation enthalpies and activation energies for the dehydration process will be given. A plausible dehydration mechanism, which is compatible with our DTA/DSC results, is deduced from TEM investigations.

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Authors and Affiliations

  1. Institut für Anorganische und Analytische Chemie der Justus-Liebig-Universität, Heinrich-Buff-Ring 58, D-35392, Gießen, Germany

    D. Walter & W. Laqua

  2. Geschäftsbereich Chemie, Ch-F, Bayer AG, D-51368, Leverkusen, Germany

    G. Buxbaum

Authors
  1. D. Walter
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  2. G. Buxbaum
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  3. W. Laqua
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Walter, D., Buxbaum, G. & Laqua, W. The Mechanism of the Thermal Transformation From Goethite to Hematite. Journal of Thermal Analysis and Calorimetry 63, 733–748 (2001). https://doi.org/10.1023/A:1010187921227

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