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An extended X-ray absorption fine structure (XAFS) study of the calcium site in a model basaltic glass, Ca3Mg4Al2Si7O24

Published online by Cambridge University Press:  05 July 2018

A. Hardwick
Affiliation:
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR
E. J. W. Whittaker
Affiliation:
Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR
G. P. Diakun
Affiliation:
SERC Daresbury Laboratory, Daresbury, Warrington WA4 4AD

Abstract

Short-range order in the oxygen co-ordination shell of the Ca ion in a glass of composition Ca3Mg4Al2Si7O24 is investigated by analysis of the extended X-ray absorption fine structure. The estimate of disorder in the short-range oxygen co-ordination is no greater than that for crystalline samples of diopside and bytownite. An estimate of the oxygen environment of calcium in the particular glass is included.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1985 

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Footnotes

*

Present address: BP Research Centre, Chertsey Road, Sunbury-on-Thames, TWI6 7LN.

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