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Clay Minerals; June 2003; v. 38; no. 2; p. 141-150; DOI: 10.1180/0009855033820084
© 2003 Mineralogical Society of Great Britain and Ireland
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Evaluation of talc morphology using FTIR and H/D substitution

E. FERRAGE1,*, F. MARTIN2, S. PETIT3, S. PEJO-SOUCAILLE4, P. MICOUD5, G. FOURTY4, J. FERRET4, S. SALVI5, P. de PARSEVAL5 and J. P. FORTUNE5

1 Groupe Géochimie de l’Environnement, LGIT, Maison des Géosciences, Université Joseph Fourier, CNRS, BP 53, 38041 Grenoble cedex 9, France, 2 LASEH, UMR 6532 HYDR’ASA, Université de Limoges, 123 Avenue Albert Thomas, Bât. Les Dryades, 87000 Limoges, France, 3 Laboratoire Hydr’ASA, Université de Poitiers-CNRS, 40, avenue du Recteur Pineau, F-86022 Poitiers Cedex, France, 4 Talc de Luzenac S. A., BP 1162, F-31036 Toulouse Cedex, France, and 5 Equipe Géomarg, LMTG, 39, allées Jules Guesde, Université Paul Sabatier-CNRS, 31000 Toulouse, France

* E-mail: Eric.Ferrage{at}obs.ujf-grenoble.fr

(Received 5 October 2000; revised 9 July 2002)

Deuteration (H/D substitution at 200°C) was performed on powders of two ground talcs of different particle shapes (different basal/lateral surface ratios). Results indicate that the deuteration process is only efficient on lateral talc surfaces, and suggest that the hydrogens located in the hexagonal ring of the talc basal surfaces are not exchanged. The FTIR spectra collected from the two talc samples show that it is possible to discriminate between particles with the same specific surface area but with different basal/lateral surface ratios using the deuteration process.

KEYWORDS: talc, particle morphology, FTIR, deuteration




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