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Article Dans Une Revue Chemical Geology Année : 2009

An O K-edge XANES study of glasses and crystals in the CaO–Al2O3–SiO2 (CAS) system

Résumé

Accepted 22 August 2008 Keywords: XANES Oxygen Glasses Structure Calciumaluminosilicate CAS We have measured the O K-edge XANES spectra of a series of standard minerals and glasses in the CaO– Al2O3–SiO2 (CAS) system. Changes observed in the spectra of simple compounds like the calcium aluminates, SiO2, AlPO4, and Al2O3, where the O atoms are surrounded by network former neighbours in four-, five-, and six-fold coordination can be used to interpret structural changes occurring in CAS glasses. In particular, changes in the coordination of Ca, as well as, changes in the Al–NBO and Al–BO distribution can be resolved. For glasses along the CaO–Al2O3 join some Ca is found to be in 9-fold coordination. However, along the (xCaO:Al2O3)–SiO2 joins (where x = 1, 1.57 and 3) the average Ca coordination decreases as the proportion of CaSiO3 increases. Furthermore, along the CaSiO3–Al2O3 join the O K-edge XANES exhibits changes consistent with AlOQ2 and Q3 species being converted to Q4 species with the addition of AlO.

Domaines

Minéralogie

Dates et versions

hal-00432435 , version 1 (16-11-2009)

Identifiants

Citer

Grant S. Henderson, Daniel R. Neuville, Laurent Cormier. An O K-edge XANES study of glasses and crystals in the CaO–Al2O3–SiO2 (CAS) system. Chemical Geology, 2009, 259, pp.54-62. ⟨10.1016/j.chemgeo.2008.08.023⟩. ⟨hal-00432435⟩
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