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Article Dans Une Revue Journal of Physics: Condensed Matter Année : 2008

Long-term physical ageing in As-Se glasses with short chalcogen chains

Résumé

Long-term physical ageing of chalcogenide glasses, which occurs over tens of years, is much less understood than the short-term ageing. With Se-rich underconstrained As30Se70 glass as a model composition (consisting of Sen chains with n≤3 on average), a microscopic model is developed for this phenomenon by combining information from differential scanning calorimetry, extended x-ray absorption fine structure, Raman, and 77Se solid state nuclear magnetic resonance spectroscopies. The accompanying changes in the electronic structure of these glasses are investigated by x-ray photoelectron spectroscopy. The data suggest ageing from cooperative relaxation, presumably involving bond switching or reconfiguration of As-Se-Se-As fragments.

Domaines

Matériaux
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Dates et versions

hal-00370907 , version 1 (25-03-2009)

Identifiants

Citer

R. Golovchak, O. Shpotyuk, A. Kozdras, M. Vlcek, Bruno Bureau, et al.. Long-term physical ageing in As-Se glasses with short chalcogen chains. Journal of Physics: Condensed Matter, 2008, 20 (24), pp.245101. ⟨10.1088/0953-8984/20/24/245101⟩. ⟨hal-00370907⟩
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