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57Fe Mössbauer Spectroscopic Study of Structural Changes during Dehydration of Nontronite: Effect of Different Exchangeable Cations

Published online by Cambridge University Press:  02 April 2024

Vittorio Luca
Vittorio Luca*
Affiliation:
Chemistry Department, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
*
1Present address: Department of Chemistry, University of Houston, Houston, Texas 77204.
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Abstract

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Dehydration-induced migration of different exchangeable cations toward the layers of nontronite has been studied by Mössbauer spectroscopy. As interlayer water is removed exchangeable cations migrate toward Fe3+ sites in the tetrahedral sheets of the nontronite (IvFe3+) causing them to distort. The amount of distortion is linearly related to the ionic potential (IP) of the exchangeable cations and is greatest for cations with highest IP. Octahedral Fe3+ sites (VIFe3+) are also affected by migration of cations into the pseudohexagonal cavities. As exchangeable cations move into the pseudohexagonal cavities, interaction with VIFe3+ sites increases. The intensity of the outer VIFe3+ Mössbauer doublet increases with respect to the inner VIFe3+ doublet as the IP of the exchangeable cation increases. It appears that the exchangeable cations play a significant role in determining the thermal stability of nontronite.

Keywords

MössbauerDehydrationNontroniteCation migrationTetrahedral site
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 5 , October 1991 , pp. 478 - 489
Copyright
Copyright © 1991, The Clay Minerals Society

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