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Crystal Chemistry of Colloids Obtained by Hydrolysis of Fe(III) in the Presence of SiO4 Ligands

Published online by Cambridge University Press:  18 March 2011

Emmanuel Doelsch ,
Armand Masion ,
Jérôme Rose ,
William E.E. Stone ,
Jean Yves Bottero  and
Paul M. Bertsch
Emmanuel Doelsch
Affiliation:
CEREGE, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France
Armand Masion
Affiliation:
CEREGE, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France
Jérôme Rose
Affiliation:
CEREGE, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France
William E.E. Stone
Affiliation:
CEREGE, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France
Jean Yves Bottero
Affiliation:
CEREGE, Europole Méditerranéen de l'Arbois, BP 80, 13545 Aix-en-Provence Cedex 04, France
Paul M. Bertsch
Affiliation:
AACES-SREL, University of Georgia, PO Drawer E, Aiken, SC 29802, USA
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Abstract

The crystal chemistry of a number of Fe-Si systems (Si/Fe 0-4, pH 3-10) was investigated by combining local scale spectroscopic methods (EXAFS, FTIR and NMR) and at the semi local scale (SAXS). The Fe clusters within the precipitates have two growth regimes depending on the Si/Fe ratio: the growth is three and two dimensional for Si/Fe fl and Si/Fe ≤ 1 respectively. The presence of Fe-O-Si bonds within the precipitated phases has been demonstrated. Their formation and relative proportion was found to be very dependent on the pH and Si concentration The size of silica domains within the precipitates was shown to increase with increasing Si/Fe and/or decreasing pH. The high fractal dimension (Df) of the aggregates is attributed to the presence of the SiO4 ligands, but the evolution of Df linearly depends on the polymerization state of iron.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 658: Symposium GG – Solid-State Chemistry of Inorganic Materials III , 2000 , GG3.36
Copyright
Copyright © Materials Research Society 2001

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