An Extended X-ray Absorption Fine Structure (EXAFS) Study of the Calcium Site in a Model Basaltic Glass, Ca3Mg4Al2Si7O24

An Extended X-ray Absorption Fine Structure (EXAFS) Study of the Calcium Site in a Model Basaltic Glass, Ca₃Mg₄Al₂Si₇O₂₄

A. Hardwick^*, E. J. W. Whittaker and G. P. Diakun

Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR
SERC Daresbury Laboratory, Daresbury, Warrington WA4 4AD

^*Present address: BP Research Centre, Chertsey Road, Sunbury-on-Thames, TW16 7LN.

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: EXAFS • basaltic glass • short-range order • diopside • bytownite

Mineralogical Magazine; March 1985 v. 49; no. 350; p. 25-29; DOI: 10.1180/minmag.1985.049.350.03
© 1985, The Mineralogical Society
Mineralogical Society (www.minersoc.org)