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The Mössbauer spectra of hydroxycarbonate green rusts

Published online by Cambridge University Press:  09 July 2018

E. Murad  and
R. M. Taylor
E. Murad
Affiliation:
Lehrstuhl für Bodenkunde, Technische Universität München, D-8050 Freising-Weihenstephan, Federal Republic of Germany
R. M. Taylor
Affiliation:
CSIRO Division of Soils, Private Bag 2, Glen Osmond, South Australia 5064
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Abstract

Mössbauer spectra of Fe2+Fe3+ and Fe2+Al hydroxycarbonates taken in the paramagnetic state were fitted using two Fe2+ and Fe3+ doublets each. These spectra can be interpreted in terms of an ordered cation arrangement in the pyroaurite-type structure. The inner Fe2+ doublet seems to be the outcome of excess Fe3+ in the samples studied. The outer Fe2+ doublet (quadrupole splitting ∼2·8 mm s−1, FWHM = 0·26 mm s−1) is relatively well-defined and can, together with the fact that this doublet disappears on oxidation, possibly serve to identify these compounds in natural systems.

Type
Research Article
Information
Clay Minerals , Volume 19 , Issue 1 , February 1984 , pp. 77 - 83
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1984

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