Record details

    Effects of chemical composition and temperature of heating on the infrared spectra of Li-saturated dioctahedral smectites. I, Mid-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. 739-751
    10 obr., 1 tab., 2 s.bibl.
    Zkr. název ser.: Clay Miner.
Subject group
    iontová výměna
    spektrometrie IR
Geographical name
    Česká republika
    Horní Dunajovice (Znojmo)
    Stebno (Ústí nad Labem)
Abstract (in english)
   Infrared spectroscopy in the mid-IR region was used to follow the structural changes occurring in five Li-saturated dioctahedral smectites upon heating. The smectites included three montmorillonites, an Fe-beidellite and a ferruginous smectite. Fixation of Li+ ions in the structure even upon heating at 120°C caused the appearance of an AlMgLiOH-stretching band near 3670 cm-1 in the spectra of all three montmorillonites. This band confirmed the presence of Li(I) in the previously vacant octahedral positions in montmorillonites. No similar band was observed in the spectra of ferruginous heated smectites with prevailing tetrahedral charge. A gradual upward frequency shift and decrease in intensity of the AlAlOH-bending band showed that Li(I) present in the hexagonal cavities causes pronounced perturbation of this OH-bending mode. The Li(I) present in the octahedral sheets causes small perturbations of the OH-bending mode near 850 cm-1 and activation of a new OH-bending mode near 803 cm-1.
   Reversible changes in the positions of the stretching Si-O and bending OH bands in the spectra of Fe-beidellite and a ferruginous smectite proved that Li was present in these minerals primarily in the hexagonal holes of the tetrahedral sheets
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    18. 7. 2007
Import date
    8. 8. 2012