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Detection of Tetrahedral Fe3+ Sites in Nontronite and Vermiculite by Mössbauer Spectroscopy

Published online by Cambridge University Press:  02 April 2024

Vittorio Luca
Vittorio Luca*
Affiliation:
Chemistry Department, Victoria University, P.O. Box 600, Wellington, New Zealand
*
1Present address: Department of Chemistry, University of Houston, 77204-5641, Houston, Texas, U.S.A.
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Abstract

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Mössbauer spectra were obtained for five Ca-exchanged nontronites and one Ca-exchanged vermiculite as the 2-layer hydrates following dehydration at 200°C. Exchange of the samples with Ca2+ and subsequent dehydration resulted in the appearance of a shoulder at about −0.50 mm/s in the Mössbauer spectra of some of the samples. The appearance of these shoulders necessitated the inclusion of doublets with Mössbauer parameters corresponding to tetrahedrally-coordinated Fe3+ (IVFe3+) in the model used to fit the Mössbauer spectra. That the IVFe3+ sites detected in these samples were those in the nontronite structure was confirmed using samples whose IVFe3+ contents have been previously determined from chemical analysis. It appears that this sample preparation method allowed IVFe3+ contents to be determined to within 40%. On this basis, the IVFe3+ content appeared to be unrelated to the total Fe content for the samples studied.

Keywords

DehydrationIsomorphic substitutionMössbauer spectroscopyNontroniteTetrahedral ironVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 39 , Issue 5 , October 1991 , pp. 467 - 477
Copyright
Copyright © 1991, The Clay Minerals Society

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