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

R. Golovchak, O. Shpotyuk, A. Kozdras, M. Vlcek, B. Bureau, A. Kovalskiy and H. Jain.

Journal of physics: condensed matter, vol. 20, 2008, p. 245101.

Abstract

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.

pdf

This entry was posted in 2008, Our publications. Bookmark the permalink.

Leave a Reply