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Clay Minerals; April 2000; v. 35; no. 2; p. 323-333
© 2000 Mineralogical Society of Great Britain and Ireland
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Research Paper

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

A. HAOUZI1, H. BELARBI1, J. C. GIUNTINI1, J. VANDERSCHUEREN2, S. STAUNTON3 and J. V. ZANCHETTA1,*,{dagger}

1 Laboratoire de Physicochimie de la Matière Condensée - Equipe de Chimie Physique (UMR 5617 CNRS), Université Montpellier II, Place Eugène Bataillon, 34095 Montpellier Cedex 5, France, 2 Chimie Macromoléculaire et Chimie Physique, Université de Liège, Institut de Chimie au Sart-Tilman, B4000 Liège, Belgium, and 3 Unité de Science du Sol, INRA, 2 place Viala, 34060 Montpellier Cedex 2, France

* E-mail: zanchet{at}1pmc.univ-montp2.fr

(Received 30 October 1998; revised 6 August 1999)

The polarization conductivity, {sigma}'({omega}) 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 conductivity, impedance spectroscopy, Ca-montmorillonite, thermally-stimulated current






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