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The influence of structural Fe, Al and Mg on the infrared OH bands in spectra of dioctahedral smectites

Published online by Cambridge University Press:  09 July 2018

J. Bishop ,
J . Madejová ,
P. Komadel  and
H. Fröschl
J. Bishop*
Affiliation:
SETI Institute/NASA-Ames ResearchCenter, MoffettField, CA 94035, USA
J . Madejová
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-84236 Bratislava, Slovakia
P. Komadel
Affiliation:
Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-84236 Bratislava, Slovakia
H. Fröschl
Affiliation:
Austrian Research Centers Seibersdorf, Chemical Analytics, A-2444 Seibersdorf, Austria
*
*E-mail: jbishop@mail.arc.nasa.gov
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Abstract

Visible to near-infrared (NIR) reflectance spectra and mid-IR transmittance spectra are presented here for a collection of dioctahedral smectites. Analysis of the structural OH vibrations is performed by comparing the NIR combination and overtone bands with fundamental stretching and bending absorption features in the mid-IR region. Second derivatives are used to determine the actual band centres, which are often shifted slightly by a spectral continuum in the reflectance or transmittance spectra. New bands have been identified near 4170 and 4000 cm–1 in the NIR spectra of nontronite with tetrahedral substitution. A related band is observed near 4100 cm–1 for montmorillonites with substantial tetrahedral and/or octahedral substitution. These bands are correlated with the mid-IR bands near 680 cm–1 for nontronite and near 630 cm–1 for montmorillonite. Comparison of the OH overtone and combination bands with the fundamental stretching and bending vibrations gives consistent results.

Keywords

infrared spectroscopysmectitesstructural OHmontmorillonitenontronite

Information

Type
Research Article
Information
Clay Minerals , Volume 37 , Issue 4 , December 2002 , pp. 607 - 616
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2002

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