Journal of Thermal Analysis and Calorimetry

, Volume 63, Issue 3, pp 733–748 | Cite as

The Mechanism of the Thermal Transformation From Goethite to Hematite

  • D. Walter
  • G. Buxbaum
  • W. Laqua
Article

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.

dehydration DTA/DSC goethite hematite IR TEM TG XRD 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • D. Walter
    • 1
  • G. Buxbaum
    • 2
  • W. Laqua
    • 1
  1. 1.Institut für Anorganische und Analytische Chemie der Justus-Liebig-UniversitätGießenGermany
  2. 2.Geschäftsbereich Chemie, Ch-FBayer AGLeverkusenGermany

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