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Gradual H/D substitution in synthetic germanium bearing talcs: a method for infrared band assignment

Published online by Cambridge University Press:  09 July 2018

F. Martin
Affiliation:
Université Paul Sabatier , Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse
S. Petit
Affiliation:
Université de Poitiers, Laboratoire ‘Hydr. A.S.A.’, UMR 6532 du CNRS, 40 Avenue du Recteur Pineau, F-86022 Poitiers Cedex
O. Grauby
Affiliation:
CRMC2-CNRS, Campus Luminy, Case 913, F-13288 Marseille Cedex 9, France
M. P. Lavie
Affiliation:
Université Paul Sabatier , Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse

Abstract

The deuteration technique was used to assign unknown infrared (IR) bands of Ge-bearing talcs. Procedures to achieve partial or complete H/D replacement in synthetic Ge-bearing (Mg, Ni and Co)-talcs have been investigated. From the spectral shift of IR absorption bands in the 4000–300 cm-1 region resulting from the H-D substitution, the IR bands of vibrations of Ge-bearing talcs could be identified and synthetic Ge-bearing talcs showed significantly different IR spectra from those for Si-talcs. After deuteration of synthetic Ge-bearing talcs, the unknown bands were attributed either to hydroxyl groups or to Ge–O vibrations of the clay skeleton, and the spectra were interpreted fully.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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