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Interpretation of the infrared spectrum of the -clays: application to the evaluation of the layer charge

Published online by Cambridge University Press:  09 July 2018

S. Petit ,
D. Righi ,
J. Madejová  and
A. Decarreau
S. Petit
Affiliation:
Université de Poitiers, CNRS UMR 6532 ‘HydrASA’, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, France
D. Righi
Affiliation:
Université de Poitiers, CNRS UMR 6532 ‘HydrASA’, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, France
J. Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, 842 36 Bratislava, Slovakia
A. Decarreau
Affiliation:
Université de Poitiers, CNRS UMR 6532 ‘HydrASA’, 40, avenue du Recteur Pineau, 86022 Poitiers Cedex, France
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Abstract

The IR spectra of -saturated smectites were examined in terms of their charge characteristics. The υ4 band near 1440 cm-1, observed in the DRIFTS spectra (obtained without use of a KBr matrix), was assigned to the vibrations of ions compensating the negative charge of the clays. When KBr was used as a diluting matrix, the υ4 band was located at 1400 and/or 1440 cm-1. The band at 1400 cm-1, related to NH4Br, originated from the replacement of in the clay by K+ from the KBr. For swelling clay minerals this band indicates that layers have permanent low charge density and/or variable charge. For non-swelling clay minerals, the 1400 cm-1 band characterizes the presence of variable charges only. The υ4 band at 1440 cm-1 suggests that in the clay was not replaced by K+ from KBr and remains in the interlayer space of the clay minerals. This absorption is due to compensating only permanent charge in the interlayers, or part of the interlayers with a high charge density. The presence of both bands at 1400 cm-1 and 1440 cm-1 in the IR spectrum suggests that the clays studied have a heterogeneous interlayer charge.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 4 , December 1999 , pp. 543 - 549
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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