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Influence of counterion species on the dehydroxylation of Ca (super 2+) -, Mg (super 2+) -, Na (super +) - and K (super +) -exchanged Wyoming montmorillonite

H. J. Bray and S. A. T. Redfern
Influence of counterion species on the dehydroxylation of Ca (super 2+) -, Mg (super 2+) -, Na (super +) - and K (super +) -exchanged Wyoming montmorillonite
Mineralogical Magazine (April 2000) 64 (2(423)): 337-346

Abstract

The dehydroxylation of Ca-, K-, Mg- and Na-saturated Wyoming montmorillonite has been studied by thermogravimetry (TG), infrared (IR) spectroscopy and X-ray diffraction (XRD). Samples saturated with either Ca (super 2+) or Mg (super 2+) show a predominantly diffusion-controlled reaction step, whereas Wyoming montmorillonite with Na (super +) and K (super +) in the interlayer exhibit control closer to first order. The activation energy of dehydroxylation is not significantly correlated to the type of interlayer cation present, in turn demonstrating that the role of vacancy location in the octahedral sheet is more significant a control on dehydroxylation.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 64
Serial Issue: 2(423)
Title: Influence of counterion species on the dehydroxylation of Ca (super 2+) -, Mg (super 2+) -, Na (super +) - and K (super +) -exchanged Wyoming montmorillonite
Affiliation: University of Cambridge, Department of Earth Sciences, Cambridge, United Kingdom
Pages: 337-346
Published: 200004
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 15
Accession Number: 2000-054330
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200018
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