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Nucleation and Growth of Fe(III)/PO4 Clusters

Published online by Cambridge University Press:  10 February 2011

J. Rose ,
A. M. Flank ,
A. Manceau ,
A. Masion ,
J. Y. Bottero ,
D. Tchoubar  and
F. Garcia
J. Rose
Affiliation:
Laboratoire Geosciences de l'Environnement, 13545 Aix en provence, France.
A. M. Flank
Affiliation:
Laboratoire pour l'Utilisation du Rayonnement Electromagnetique, 91405 Orsay, France.
A. Manceau
Affiliation:
Groupe Geochimie, LGIT-IRIGM, 38042 Grenoble, France.
A. Masion
Affiliation:
Laboratoire Geosciences de l'Environnement, 13545 Aix en provence, France.
J. Y. Bottero
Affiliation:
Laboratoire Geosciences de l'Environnement, 13545 Aix en provence, France.
D. Tchoubar
Affiliation:
CRMD, 45067 Orleans, France
F. Garcia
Affiliation:
Elf-Atochem, Centre de recherche Rhône-Alpes, 69310 Pierre-Benite, France.
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Abstract

The first stages of the hydrolysis of Fe(III) in presence of PO4 were studied at the local (P k-edge and Fe k-edge EXAFS spectroscopy) and semi-local scale (SAXS). The presence of PO4 hinders the polymerization of iron at the edge sharing dimer step. Phosphate probably governs the local structure leading to the formation of small and dense clusters. The fitting of both k-edge EXAFS spectroscopies requiered the use of a new 3D model of each nucleation step.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 432: Symposium S – Aqueous Chemistry and Geochemistry of Oxides , 1996 , 151
Copyright
Copyright © Materials Research Society 1997

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