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Comparison between thermally-stimulated current and complex impedance spectroscopy measurements on a dehydrated Ca-montmorillonite

Published online by Cambridge University Press:  09 July 2018

A. Haouzi ,
H. Belarbi ,
J. C. Giuntini ,
J. Vanderschueren ,
S. Staunton  and
J. V. Zanchetta
A. Haouzi
Affiliation:
1Laboratoire de Physicochimie de la Matière Condensée - Equipe de Chimie Physique (UMR 5617 CNRS), Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
H. Belarbi
Affiliation:
1Laboratoire de Physicochimie de la Matière Condensée - Equipe de Chimie Physique (UMR 5617 CNRS), Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
J. C. Giuntini
Affiliation:
1Laboratoire de Physicochimie de la Matière Condensée - Equipe de Chimie Physique (UMR 5617 CNRS), Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
J. Vanderschueren
Affiliation:
Chimie Macromoléculaire et Chimie Physique, Université de Liège, Institut de Chimie au Sart-Tilman, B4000 Liège, Belgium
S. Staunton
Affiliation:
Unité de Science du Sol, INRA, 2 place Viala, 34060 Montpellier Cedex 2, France
J. V. Zanchetta*
Affiliation:
1Laboratoire de Physicochimie de la Matière Condensée - Equipe de Chimie Physique (UMR 5617 CNRS), Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France
*
*E-mail: [email protected]
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Abstract

The polarization conductivity, σ'(ω) of a Ca-montmorillonite has been determined by complex impedance spectroscopy. The technique of thermally-stimulated currents (TSC) leads to the determination of the different relaxation parameters, such as the distribution function of the different relaxation processes. The results demonstrated the coherence of the two approaches, and confirmed that the conducting phenomenon is due to the hopping of charge carriers between localized sites. The energy corresponding to the hopping process is evaluated using two different methods of analysis of the TSC signal. The values obtained are compared to those observed on a Na-montmorillonite.

Keywords

polarization conductivityimpedance spectroscopyCa-montmorillonitethermally-stimulated current
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 2 , April 2000 , pp. 323 - 333
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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