Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 24, Issue 50, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-8984/24/50/505106
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- STCU [5429]
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The long-term kinetics of physical ageing at ambient temperature is studied in Se-rich As-Se glasses using the conventional differential scanning calorimetry technique. It is analysed through the changes in the structural relaxation parameters occurring during the glass-to-supercooled liquid transition in the heating mode. Along with the time dependences of the glass transition temperature (T-g) and partial area (A) under the endothermic relaxation peak, the enthalpy losses (Delta H) and calculated fictive temperature (T-F) are analysed as key parameters, characterizing the kinetics of physical ageing. The latter is shown to have step-wise character, revealing some kinds of subsequent plateaus and steep regions. A phenomenological description of physical ageing in the investigated glasses is proposed on the basis of an alignment-shrinkage mechanism and first-order kinetic equations.
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