| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1481215 | Journal of Non-Crystalline Solids | 2013 | 5 Pages |
Free volume redistribution, caused by structural relaxation during long-term natural physical ageing, is revealed by positron annihilation lifetime technique for AsxSe100-x and GeySe100-y glasses. It is shown, that two-state positron trapping model is appropriate for an adequate description of changes caused by long-term physical ageing in the atomic-deficient subsystem of these materials. The observed behaviour of defect-related component in the fit of the experimentally measured PAL spectra for aged and rejuvenated glasses testifies in favour of fragmentation of larger free volume entities.
► PAL data are recorded for aged and non-aged chalcogenide glasses. ► Fragmentation of large free-volume entities during ageing is shown. ► Adequacy of 2-state positron trapping model for ageing description is demonstrated.
