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A Mössbauer and I.R. Spectroscopic Study of the Structure of Nontronite

Published online by Cambridge University Press:  01 July 2024

B. A. Goodman ,
J. D. Russell ,
A. R. Fraser  and
F. W. D. Woodhams
B. A. Goodman
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, U.K.
J. D. Russell
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, U.K.
A. R. Fraser
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen AB9 2QJ, U.K.
F. W. D. Woodhams
Affiliation:
Department of Natural Philosophy, University of Aberdeen, Aberdeen, U.K.
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Abstract

Mössbauer and i.r. spectra of a series of nontronites show that Fe3+ and Al3+ are distributed between tetrahedral and octahedral sites. The Mössbauer results have reaffirmed the occupation by Fe3+ of octahedral sites at which these ions are coordinated to pairs of OH groups in both cis and trans configurations. The distribution of Fe3+ between these two sites varies considerably but in all of the nontronites some Fe3+ occurs in the trans site in contrast to the all cis occupancy of the centro-symmetric structure proposed by Mering and Oberlin (1967). In one of the nontronites the distribution of Fe3+ between these two sites approaches that in the ideal non-centrosymmetric structure proposed for montmorillonite.

Information

Type
Research Article
Information
Clays and Clay Minerals , Volume 24 , Issue 2 , April 1976 , pp. 53 - 59
Copyright
Copyright © 1976 The Clay Minerals Society

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