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A unified model of physical ageing in chalcogenide glasses.

Shpotyuk O. I., Golovchak R. Y., Kozdras A., Szymura S.

Archives of Materials Science

2006

Vol. 27, nr 4

143-158

Physical ageing processes in As(Ge)-Se glasses are analyzed using the chains crossing model and the constraints theory. It is shown that short-term physical ageing in these materials is fully determined by elementary relaxation acts of inner Se atoms within Se chains leading to the straightening of the latter with further shrinkage of glass matrix. Long term physical ageing is associated with pure shrinkage of under-constrained glass network. Phenomenological model of physical ageing in As(Ge)-Se glasses is developed to explain its compositional behaviour. The main statements of the model are verified by differential scanning calorimetry for chalcogenide glasses of As-Se family.