کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1481215 | 1510461 | 2013 | 5 صفحه PDF | دانلود رایگان |
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.
Journal: Journal of Non-Crystalline Solids - Volume 377, 1 October 2013, Pages 49–53