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Synthesis and crystallogenesis of ferric smectite by evolution of Si-Fe coprecipitates in oxidizing conditions

Published online by Cambridge University Press:  09 July 2018

A. Decarreau ,
D. Bonnin ,
D. Badaut-Trauth ,
R. Couty  and
P. Kaiser
A. Decarreau
Affiliation:
Laboratoire de Géochimie des Roches Sédimentaires, UA CNRS 723, Université Paris-Sud, F.91405 Orsay Cedex
D. Bonnin
Affiliation:
Laboratoire de Physique Quantique, UA CNRS 421, ESPCI, 10 rue Vauquelin, F.75231 Paris Cedex 05
D. Badaut-Trauth
Affiliation:
Laboratoire de Géochimie des Roches Sédimentaires, UA CNRS 723, Université Paris-Sud, F.91405 Orsay Cedex
R. Couty
Affiliation:
Laboratoire de Géologie, UA CNRS 224, Ecole Normale Supéieure, 46 rue d'Ulm, F.75005 Paris, France
P. Kaiser
Affiliation:
Laboratoire de Physique Quantique, UA CNRS 421, ESPCI, 10 rue Vauquelin, F.75231 Paris Cedex 05
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Abstract

Silico-ferric coprecipitates, with chemical formula , were aged in suspension at 75°, 100° and 150°C and the structural evolution of solids with time studied by XRD, TEM, and IR, Mössbauer and EXAFS spectroscopy. The initial Si-Fe coprecipitate was found to be amorphous but showed local order similar to that of a smectite layer. At 75°C only a weak structural evolution of the silico-ferric product towards a smectite-like structure was observed. Experiments performed at 100° and 150°C led to synthesis of a ferric smectite with structural formula . During syntheses a highly soluble silico-ferric complex appeared; the Si/Fe atomic ratio of this complex was 3, and the apparent concentration of Fe3+ in solution reached 27 mm/l. These syntheses prove that the crystallization of a dioctahedral smectite, containing only Fe3+ atoms in the octahedral sheet, is possible under strictly oxidizing conditions. However, crystal growth of a ferric smectite under these conditions is slow and only syntheses carried out at sufficiently high temperatures give convincing results.

Type
Research Article
Information
Clay Minerals , Volume 22 , Issue 2 , June 1987 , pp. 207 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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