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Characterization of Octahedral Substitutions in Kaolinites Using Near Infrared Spectroscopy

Published online by Cambridge University Press:  28 February 2024

S. Petit
Affiliation:
Université de Poitiers, UMR CNRS 6532 “Hydr.A.S.A”, 40, avenue du recteur Pineau, F-86022 Poitiers CEDEX, France
J. Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
A. Decarreau
Affiliation:
Université de Poitiers, UMR CNRS 6532 “Hydr.A.S.A”, 40, avenue du recteur Pineau, F-86022 Poitiers CEDEX, France
F. Martin
Affiliation:
Université Paul Sabatier, Laboratoire de Minéralogie-Cristallographie, UMR 5563 CNRS, 39 Allées Jules Guesde, F-31000 Toulouse, France

Abstract

Fourier transform infrared (FTIR) spectroscopy investigations in the near infrared (N1R) region of synthetic and natural kaolinites with various octahedral substitutions have been carried out in order to elucidate the relationships between the substituted cations and specific features of the NIR spectra. The combination modes of the OH stretching and bending vibrations characterizing Fe(III), Ga(III) and Cr(III) octahedral substitutions are identified in the NIR region at 4466, 4498 and 4474 cm-1, respectively, and the first overtones of the OH stretching vibrations at 7018, 7018 and 6986 cm-1, respectively. As far as we know, the bands of kaolinites containing Ga(III) or Cr(III) have not been reported yet. For both Ga(III) and Cr(III), the NIR observations explain why the bending vibration bands of AlGaOH and AlCrOH groups are not observed in the middle infrared (MIR) region.

Type
Research Article
Copyright
Copyright © 1999, The Clay Minerals Society

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