Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (1) Citing Articles via Google Scholar Google Scholar Articles by MARTIN, F. Articles by SALVI, S. Search for Related Content GeoRef GeoRef Citation

Fine-probing the crystal-chemistry of talc by MAS-NMR spectroscopy

¹ HydrASA, UMR 6532 Université de Limoges-CNRS, 123 avenue Albert Thomas, F-87060 Limoges, France
² ERT Géomatériaux et HYMEDIA, UMR 5563 Université Paul Sabatier-CNRS, OMP-LMTG, 14 avenue Edouard Belin, F-1000 Toulouse, France
³ Department of Mineralogy, The Natural History Museum, Cromwell Road, London, SW7 5BD, UK
⁴ HydrASA, UMR 6532 Université de Poitiers-CNRS, 40 avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
⁵ Laboratoire de Matériaux à Porosité Contrôlée, UMR 7016 Université de Mulhouse-CNRS, ENSCMu, 3 rue Alfred Werner, F-68093 Mulhouse Cedex, France
⁶ Talc de Luzenac S.A., BP 1162, F-31036 Toulouse Cedex, France

^* E-mail: francois.martin{at}unilim.fr

Magic-Angle-Spinning Nuclear Magnetic Resonance (MAS-NMR) spectroscopy was used to probe the crystallographic environment of Si, Al, F and H in 14 natural talc samples originating from different localities and containing various, small amounts of iron (Fe₂O₃ [_total] < 2 wt %). We show that iron induces strong variations in NMR spectra and that even very low quantities can be used as an indirect NMR parameter to characterize in detail the crystal-chemistry of talc. Conversely, their correlations with full width at half height (FWHH) in MAS-NMR spectra for ²⁹Si, ²⁷Al, ¹H, and ¹⁹F obtained from these 14 talc samples allow for rapid estimations of the total iron content. Finally we highlight how, by simply recording Mössbauer, NIR and NMR spectra, one can obtain an accurate structural formula of talc, which is a necessary parameter for uses in specific industrial applications.

Key-words: MAS-NMR, talc, crystal-chemistry, substitution, iron.

This article has been cited by other articles:

				C. NKOUMBOU, F. VILLIERAS, O. BARRES, I. BIHANNIC, M. PELLETIER, A. RAZAFITIANAMAHARAVO, V. METANG, C. YONTA NGOUNE, D. NJOPWOUO, and J. YVON Physicochemical properties of talc ore from Pout-Kelle and Memel deposits (central Cameroon) Clay Minerals, June 1, 2008; 43(2): 317 - 337. [Abstract] [Full Text] [PDF]