Structural evolution during the dehydration of gypsum materials

S. D M Jacques, A. Gonzjález-Saborido, O. Leynaud, J. Bensted, M. Tyrer, R. I W Greaves, P. Barnes

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

The dehydration of pure and waste gypsums has been examined using in situ synchrotron angledispersive X-ray diffraction. Pure gypsum was studied under a number of defined environments; various industrial waste gypsums were also studied under a common standard environment. It is found that the dehydration of gypsum to anhydrite proceeds via the hemihydrate and γ-anhydrite phases and the interplay and behaviour of these phases has been determined by full structural 'Rietveld' refinement. In the study of the pure gypsum system, the hemihydrate structure is shown to be preserved as water is lost. A 'zero-water hemihydrate' is observed before refinement in the higher symmetry γ-anhydrite cell is possible. The waste gypsum materials studied showed significant differences in the temperatures at which key transformation events occurred; these observations raise implications concerning the re-use of by-product gypsum materials. Finally, high temperature data are re-examined in the search for a variation of the anhydrite structure.

Original languageEnglish
Pages (from-to)421-432
Number of pages12
JournalMineralogical Magazine
Volume73
Issue number3
DOIs
Publication statusPublished - Apr 2009
Externally publishedYes

Keywords

  • Dehydration
  • Gypsum

ASJC Scopus subject areas

  • Geochemistry and Petrology

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    Jacques, S. D. M., Gonzjález-Saborido, A., Leynaud, O., Bensted, J., Tyrer, M., Greaves, R. I. W., & Barnes, P. (2009). Structural evolution during the dehydration of gypsum materials. Mineralogical Magazine, 73(3), 421-432. https://doi.org/10.1180/minmag.2009.073.3.421