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The transformation of synthetic hectorite in the presence of Cu(II)

Hakon Fischer, Peter G. Weidler, Bernard Grobety, Joerg Luster and Andreas U. Gehring
The transformation of synthetic hectorite in the presence of Cu(II)
Clays and Clay Minerals (April 2009) 57 (2): 139-149

Abstract

The influence of Cu(II) on the hydrothermal and thermal transformations of a synthetic hectorite was investigated by a combined approach using mainly X-ray diffraction, thermal analyses, and electron paramagnetic resonance spectroscopy. The presence of Cu(II) during hydrothermal treatment increased the crystallite size. Copper (II) was both structure-bound and associated with the inner surfaces of the particles. Upon heating, structural destabilization of the hectorite began at approximately 400 degrees C as indicated by the formation of free radicals. Between 600 and 700 degrees C, the hectorite converted to enstatite, and in the presence of Cu(II), to enstatite and richterite. The formation of richterite as an additional conversion product is explained by the creation of structural weakness due to structure-bound Cu(II) in F-containing hectorite. Our results suggest that traces of Cu(II), typical of natural environments, may influence the conversion products in high-temperature geochemical systems.


ISSN: 0009-8604
EISSN: 1552-8367
Coden: CLCMAB
Serial Title: Clays and Clay Minerals
Serial Volume: 57
Serial Issue: 2
Title: The transformation of synthetic hectorite in the presence of Cu(II)
Affiliation: ETH Zurich, Institute of Geophysics, Zurich, Switzerland
Pages: 139-149
Published: 200904
Text Language: English
Publisher: Clay Minerals Society, Clarkson, NY, United States
References: 32
Accession Number: 2009-068194
Categories: Geochemistry of rocks, soils, and sedimentsSedimentary petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Forschungszentrum Karlsruhe, DEU, Federal Republic of GermanyUniversite de Fribourg, CHE, SwitzerlandSwiss Federal Institute for Forest, CHE, SwitzerlandLandscape Research WSL, CHE, Switzerland
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Clay Minerals Society. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200937
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