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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 ,
E. J. W. Whittaker  and
G. P. Diakun
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
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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.

Keywords

EXAFSbasaltic glassshort-range orderdiopsidebytownite
Type
Research Article
Information
Mineralogical Magazine , Volume 49 , Issue 350 , March 1985 , pp. 25 - 29
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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