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Formation of iron-rich phyllosilicates in the FeO–SiO2–H2O system during hydrothermal synthesis as a function of pH

Published online by Cambridge University Press:  14 March 2024

Liva Dzene*
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Amira Doggaz
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Patrick Dutournié
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Sayako Inoué
Affiliation:
Geodynamics Research Center (GRC), Ehime University, Matsuyama, Ehime, Japan
Mustapha Abdelmoula
Affiliation:
LCPME, CNRS-Université de Lorraine UMR7564, Nancy, France
Alexandra Jourdain
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Jean-Marc Le Meins
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Jocelyne Brendlé
Affiliation:
Institut de Science des Matériaux de Mulhouse CNRS UMR 7361, Université de Haute-Alsace, Université de Strasbourg, Mulhouse, France
Christelle Martin
Affiliation:
Andra, Scientific & Technical Division, Waste, Radionuclides, Chemicals & Geochemistry Department, Châtenay-Malabry, France
Nicolas Michau
Affiliation:
Andra, Scientific & Technical Division, Waste, Radionuclides, Chemicals & Geochemistry Department, Châtenay-Malabry, France
*
Corresponding author: Liva Dzene; Email: liva.dzene@uha.fr

Abstract

The formation of iron-rich phyllosilicates can occur at different natural or engineered settings. In this study, the influence of pH in the hydrothermal synthesis of iron-rich phyllosilicates was investigated in the pH range 8.50–12.10 after the ageing of the precursor. The synthesized samples were characterized by powder X-ray diffraction, Raman and Mössbauer spectroscopies and transmission electron microscopy. Three domains of pH were identified, and these correlated with silica availability and its speciation in the solution. The formation of 1:1-type FeIII/FeII phyllosilicate was observed between pH 9.67 and 10.75. Above pH 10.75, two types of phyllosilicate-like mineral phases were observed. In addition to 1:1-type FeIII/FeII phyllosilicate, 2:1-type FeIII/FeII phyllosilicate was observed. Below pH 9.67, mainly amorphous silica and iron oxides were observed. The findings show that pH governed the crystallinity and nature of the obtained phyllosilicate-like phases.

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Article
Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press on behalf of The Mineralogical Society of the United Kingdom and Ireland

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