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Fe3+/Al3+ partitioning between tetrahedral and octahedral sites in dioctahedral smectites

Published online by Cambridge University Press:  27 February 2018

A. Decarreau  and
S. Petit
A. Decarreau*
Affiliation:
Université de Poitiers, CNRS UMR 7285 IC2MP, HydrASA, 6 rue Michel Brunet, F-86073 Poitiers Cedex 9, France
S. Petit
Affiliation:
Université de Poitiers, CNRS UMR 7285 IC2MP, HydrASA, 6 rue Michel Brunet, F-86073 Poitiers Cedex 9, France
*
*E-mail: [email protected]
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Abstract

The distribution of Al3+ and Fe3+ between octahedral and tetrahedral sites of dioctahedral smectites was shown to be controlled by a partition coefficient Kd(4/6) = [(Fe3+)4×(Al3+)6]/[(Fe3+)6×(Al3+)4]. The Kd(4/6) value is near 0.006 for natural dioctahedral smectites, formed between 2 and ~100°C, and near 0.0174 for smectites synthesized at 200°C. These Kd(4/6) values, obtained from both chemical and spectroscopic data, were consistent with those calculated using the ionic radii of cations and Brice’s model (Brice, 1975). The partition coefficient approach explained well why for natural and synthetic dioctahedral smectites no tetrahedral Fe3+ is detected when the total Fe3+ content is below 3 atoms per unit cell (24 oxygen atoms).

Keywords

iron smectitestetrahedral Fe3+partition coefficient
Type
Research Article
Information
Clay Minerals , Volume 49 , Issue 5 , December 2014 , pp. 657 - 665
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2014

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