Hostname: page-component-cd9895bd7-gxg78 Total loading time: 0 Render date: 2024-12-27T12:44:40.216Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bishop, J.L., Pieters, C.M. & Edwards, J.O. (1994) Infrared spectroscopic analyses on the nature of water in montmorillonite. Clays Clay Miner. 42, 702–716.CrossRefGoogle Scholar
Bishop, J., Murad, E., Madejová, J., Komadel, P., Wagner, U. & Scheinost, A. (1999) Visible, Mössbauer and infrared spectroscopy of dioctahedral smectites: Structural analyses of the Fe-bearing smectites Sampor, SWy-1 and SWa-1. Proc. 11th Int. Clay Conf., Ottawa, Canada, 1997, 413-420.Google Scholar
Calvet, R. & Prost, R. (1971) Cation migration into empty octahedral sites and surface properties of clays. Clays Clay Miner. 19, 175–186.CrossRefGoogle Scholar
Cariati, F., Erre, L., Micera, G., Piu, P. & Gessa, C. (1981) Water molecules and hydroxyl groups in montmorillonites as studied by near infrared spectroscopy. Clays Clay Miner. 29, 157–159.CrossRefGoogle Scholar
Farmer, V.C. (1974) Layer silicates. Pp. 331–363 in: Infrared Spectra of Minerals (Farmer, V.C., editor). Monograph 4, Mineralogical Society, London.CrossRefGoogle Scholar
Hunt, G.R. & Salisbury, J.W. (1970) Visible and near infrared spectra of minerals and rocks: VI. Silicate minerals. Modern Geol. 1, 283–300.Google Scholar
Hunt, G.R., Salisbury, J.W. & Lenhoff, C.J. (1973) Visible and near infrared spectra of minerals and rocks: VI. Additional silicates. Modern Geol. 4, 85–106.Google Scholar
Madejová, J., Bujdák, J., Petit, S. & Komadel, P. (2000) Effects of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. (I) Mid-infrared region. Clay Miner. 35, 739–751.CrossRefGoogle Scholar
Petit, S., Madejová, J., Decarreau, A. & Martin, F. (1999) Characterization of octahedral substitutions in kaolinites using near infrared spectroscopy. Clays Clay Miner. 47, 103–108.CrossRefGoogle Scholar
Sposito, G., Prost, R. & Gaultier, J.P. (1983) Infrared spectroscopic study of adsorbed water on reducedcharge Na/Li montmorillonites. Clays Clay Miner. 31, 9–16.CrossRefGoogle Scholar
Szymański, H.A. (1964) IR Theory and Practice of Infrared Spectroscopy. Plenum Press, New York.CrossRefGoogle Scholar