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Synthesis and crystallogenesis at low temperature of Fe(III)-smectites by evolution of coprecipitated gels: experiments in partially reducing conditions

Published online by Cambridge University Press:  09 July 2018

A. Decarreau  and
D. Bonnin
A. Decarreau
Affiliation:
Laboratoire de Géochimie des Roches Sédimentaires, U.A.-C.N.R.S. no 723, Université Paris-Sud, F-91405 Orsay Cedex
D. Bonnin
Affiliation:
Laboratoire de Physique Quantique, U.A.-C.N.R.S. no 421, E.S.P.C.I., 10 rue Vauquelin, F-75231 Paris Cedex 05, France
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Abstract

Syntheses of ferric smectites were performed at low temperature (75° C by aging coprecipitated gels of silica and Fe2+-sulphate under initially reducing then oxidizing conditions. Under strictly reducing conditions only nuclei of a trioctahedral ferrous stevensite were observed and crystal growth did not take place. When a spontaneous oxidization, in contact with air, was effected, the ferrous smectite nuclei transformed rapidly into a ferric, nontronite-like, smectite. Crystallogenesis of the ferric smectite was studied by XRD, IR, DTA, Mössbauer and EPR spectroscopies. The end-synthesis smectite contained only Fe3+ ions, all located in the octahedral sheet. This clay was mixed with a cryptocrystalline iron oxide phase containing one-third of the iron atoms and undetectable by XRD.

Information

Type
Research Article
Information
Clay Minerals , Volume 21 , Issue 5 , December 1986 , pp. 861 - 877
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1986

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