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Structural Studies of Nontronites with Different Iron Contents by 57Fe Mössbauer Spectroscopy

Published online by Cambridge University Press:  02 April 2024

C. M. Cardile  and
J. H. Johnston
C. M. Cardile
Affiliation:
Chemistry Department, Victoria University of Wellington, Private Bag, Wellington, New Zealand
J. H. Johnston*
Affiliation:
Chemistry Department, Victoria University of Wellington, Private Bag, Wellington, New Zealand
*
1To whom all correspondence should be addressed.
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Abstract

The 57Fe Mössbauer spectra of a series of untreated and Ca-saturated nontronites showed a predominant Fe3+ resonance which was computer-fitted with two Fe3+ doublets defining iron in non-equivalent cis-FeO4(OH)2 octahedral sites. In most spectra a doublet indicating tetrahedral Fe3+ was fitted and in one untreated sample a doublet indicating interlayer Fe3+ was identified. In a further untreated sample the interlayer iron was present as Fe2+. Upon Ca-saturation the interlayer iron was displaced. It also appears that the interlayer iron was present in at least two different interlayer sites. From the computer-fitted data it was clear that the interlayer cations have a significant effect on the Mössbauer resonances of iron in the two non-equivalent cis-octahedral and the tetrahedral sites of nontronite.

Keywords

Interlayer cationIronMössbauer spectroscopyNontroniteStructural sites
Type
Research Article
Information
Clays and Clay Minerals , Volume 33 , Issue 4 , August 1985 , pp. 295 - 300
Copyright
Copyright © 1985, The Clay Minerals Society

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