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Effects of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. (II) Near-infrared region

Published online by Cambridge University Press:  09 July 2018

J. Madejová ,
J. Bujdák ,
S. Petit  and
P. Komadel
J. Madejová*
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
J. Bujdák
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
S. Petit
Affiliation:
Université de Poitiers, CNRS UMR 6532 ‘HydrASA’, 40, avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
P. Komadel
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia
*
*E-mail: uachjmad@savba.sk
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Abstract

Diffuse reflectance spectra in the near-infrared region are presented for Li-saturated smectites heated up to 200°C. The smectites included three montmorillonites, an Fe-beidellite and a ferruginous smectite. Unheated samples showed a complex band near 7060 cm-1 assigned to the first overtone of the OH-stretching mode of structural hydroxyl groups and bound H2O. The OH combination bands appeared in the 4600-4300 cm-1 region. Spectra of heated montmorillonites showed an upward shift and splitting of the OH-overtone band into two components near 7170 and 7110 cm-1. The presence of a band near 7170 cm-1, assigned to the overtone of the AlMgLiOH-stretching vibration, implied that local trioctahedral domains were created upon Li(I) fixation in the previously vacant octahedral positions of montmorillonites. The OH combination bands were shifted to higher frequencies and a new band appeared near 4472 cm-1 in the spectra of montmorillonites heated to temperatures in excess of 130°C. No features indicating Li(I) in the structure of Fe-beidellite or ferruginous smectite were observed in the NIR spectra.

Keywords

smectiteLi fixationIR spectranear-IR regionDRIFT
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 5 , December 2000 , pp. 753 - 761
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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