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Research Paper |
1 Institute of Inorganic Chemistry, Slovak Academy of Sciences, SK-842 36 Bratislava, Slovakia and 2 Université de Poitiers, CNRS UMR 6532 ‘HydrASA’, 40, avenue du Recteur Pineau, F-86022 Poitiers Cedex, France
* E-mail: uachjmad{at}savba.sk
(Received 8 February 2000; revised 22 May 2000)
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: smectite, Li fixation, IR spectra, near-IR region, DRIFT
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