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Mössbauer and IR analysis of iron sites in four ferruginous smectites

Published online by Cambridge University Press:  09 July 2018

J. D. Cashion ,
W. P. Gates  and
A. Thomson
J. D. Cashion*
Affiliation:
School of Physics, Monash University, Victoria 3800, Australia
W. P. Gates
Affiliation:
Department of Civil Engineering, Monash University, Victoria 3800, Australia
A. Thomson
Affiliation:
School of Physics, Monash University, Victoria 3800, Australia
*
*E-mail: [email protected]
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Abstract

57Fe Mössbauer spectra of the Na+- and Ca2+-saturated forms of four ferruginous smectites,displaying a range of compositions, have been fitted with Voigtian profiles to represent (principally) two correlated distributions of isomer shifts and quadrupole splittings for the Fe3+ sites. Correlating the areas and hyperfine parameters of these distributions with simulations of the octahedral array of cations based on chemical analyses and infrared spectroscopy has enabled identification of the Fe3+ ions that contribute to the outer quadrupole doublet. The octahedral Fe3+ sites are characterized as having at least one Mg2+ nearest-cation neighbour and probably a cisconfiguration with respect to the OH– ions.

Keywords

Mössbauer spectroscopyIRferruginoussmectitesVoigtian profilesFe3+Fe2+
Type
Research Article
Information
Clay Minerals , Volume 43 , Issue 1 , March 2008 , pp. 83 - 93
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2008

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