Ac conductivity and dielectric behavior of hydrated homoionic alkali-cations-exchanged montmorillonite

The dielectric properties of a series of homoionic alkali-exchanged montmorillonites were studied at different treatment temperatures and various water loadings by means of complex impedance spectroscopy. To date, however, this method has been underutilized in clay minerals studies. The main objecti...

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Bibliographic Details
Published in:Spectroscopy letters 2017-03, Vol.50 (3), p.171-175
Main Authors: Abdessamad, M., Kharroubi, M., Lefkaier, I. K., Bentria, B., Haouzi, A.
Format: Article
Language:English
Subjects:
Cation exchanging
Clay minerals
Dielectric properties
Hydration
Impedance spectroscopy
ion conductivity
Jonscher's law
Montmorillonite
Permittivity
Water chemistry
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Summary:The dielectric properties of a series of homoionic alkali-exchanged montmorillonites were studied at different treatment temperatures and various water loadings by means of complex impedance spectroscopy. To date, however, this method has been underutilized in clay minerals studies. The main objective of the present work is to understand the relaxation mechanisms of water molecules interacting with different hydration centers in clay minerals, with a view to eventually control their interactions with the alkali extra-framework cations. The other part of our study is to study the dielectric properties such as real and imaginary parts of dielectric permittivity, loss tangent, and ac conductivity in the frequency range 10 −2 -10 6  Hz and temperature range 173-333 K of these clay minerals. The obtained results have been discussed in terms of the Jonscher model.
ISSN:0038-7010
1532-2289
DOI:10.1080/00387010.2017.1304965