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Infrared Reflectance Study of Thermally Treated Li- and Cs-Montmorillonites

Published online by Cambridge University Press:  28 February 2024

M. A. Karakassides ,
D. Petridis  and
D. Gournis
M. A. Karakassides
Affiliation:
Institute of Materials Science, NCSR 《Demokritos》, 153 10 Ag. Paraskevi Attikis, Greece
D. Petridis
Affiliation:
Institute of Materials Science, NCSR 《Demokritos》, 153 10 Ag. Paraskevi Attikis, Greece
D. Gournis
Affiliation:
Institute of Physical Chemistry, NCSR 《Demokritos》, 153 10 Ag. Paraskevi Attikis, Greece
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Abstract

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The structure of Li- and Cs-montmorillonites was studied using infrared (IR) reflectance spectroscopy. The spectra of heat-treated clays between 80 and 220 °C were analyzed by Kramers-Krönig inversion in order to obtain the optical and dielectric properties of the clays. The analysis revealed the transverse-optic (TO) and longitudinal-optic (LO) components of the asymmetric stretching vibration of Si-O-Si bridges. Major differences, in particular the systematic development of new bands, were found in the Li-montmorillonite LO and TO spectra with increasing temperature. These changes were attributed to the migration of the Li-cations into the layer structure.

Keywords

Cs-MontmorilloniteLi-MontmorilloniteLongitudinal-Optic (LO) ModeMigrationReflectivityTransverse-Optic (TO) Mode
Type
Research Article
Information
Clays and Clay Minerals , Volume 45 , Issue 5 , October 1997 , pp. 649 - 658
Copyright
Copyright © 1997, The Clay Minerals Society

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