Pressure-induced Ge coordination change and polyamorphism in SiO2–GeO2 glasses. - Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie Accéder directement au contenu
Article Dans Une Revue Journal of Non-Crystalline Solids Année : 2004

Pressure-induced Ge coordination change and polyamorphism in SiO2–GeO2 glasses.

Résumé

The pressure-induced coordination change of Ge from fourfold to sixfold coordination state has been studied by in situ high pressure X-ray Absorption Spectroscopy at Ge K-edge, in SiO2–GeO2 tetrahedral framework glasses. The transformation occurs at higher pressure and over a broader pressure range when the SiO2 content increases. A careful analysis of both XANES and EXAFS signals supports a model of a mixing of [4]Ge and [6]Ge states in the transition region, in agreement with a kinetically hindered first-order process for the transformation at room temperature.

Dates et versions

hal-00085027 , version 1 (11-07-2006)

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Citer

O. Majérus, L. Cormier, J.-P. Itié, L. Galoisy, D.R. Neuville, et al.. Pressure-induced Ge coordination change and polyamorphism in SiO2–GeO2 glasses.. Journal of Non-Crystalline Solids, 2004, 345-346, pp.34-38. ⟨10.1016/j.jnoncrysol.2004.07.039⟩. ⟨hal-00085027⟩
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