Record details

    Effects of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. II, Near-infrared region
Statement of responsibility
    J. Madejová, J. Bujdák, S. Petit, P. Komadel
    Bujdák, J.
    Komadel, P.
    Madejová, J.
    Petit, S.
Source title - serial
    Clay minerals
    Vol. 35, no. 5
    p. 753-761
    7 obr., 1 tab., 11 bibl.
    Lokality vzorků (LOC) totožné jako v části (I) - viz. s. 754
    Zkr. název ser.: Clay Miner.
Subject group
    spektrometrie IR
Geographical name
    Česká republika
    Horní Dunajovice (Znojmo)
    Stebno (Ústí nad Labem)
Abstract (in english)
   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 4060 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 component 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 appeard 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 of ferruginous smectite were observed in the NIR spectra
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    18. 7. 2007
Import date
    8. 8. 2012