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Infrared Spectroscopy Study of Tetrahedral and Octahedral Substitutions in an Interstratified Illite-Smectite Clay

Published online by Cambridge University Press:  28 February 2024

E. Srasra ,
F. Bergaya  and
J. J. Fripiat
E. Srasra
Affiliation:
Unité de chimie appliquée, I.N.R.S.T., B.P.: 95-2050, Hammam-Lif, Tunisie
F. Bergaya
Affiliation:
CRMD CNRS, 1 B, Rue de la férollerie, 45075, Orléans Cedex 2, France
J. J. Fripiat
Affiliation:
Department of Chemistry and Laboratory for Surface Studies, P.O. Box 413, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201
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Abstract

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Infrared spectroscopy is used to distinguish between octahedral and tetrahedral substitutions in an interstratified illite-smectite clay. The Hofmann-Klemen (Li) test suggests that the AlMg□ and FeMg□ octahedral vacancies are preferentially occupied by Li after thermal treatment at 250°C. The ammonium (Chourabi-Fripiat) test reveals the beidellitic character by the formation of two OH stretching modes upon deammonation. The illitic layers are not affected since K is not exchangeable.

Keywords

Chourabi-Fripiat testHofmann-Klemen effectIlliteInfrared spectroscopyInterstratifiedSmectiteTetrahedral substitution
Type
Research Article
Information
Clays and Clay Minerals , Volume 42 , Issue 3 , June 1994 , pp. 237 - 241
Copyright
Copyright © 1994, Clay Minerals Society

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