Sub-Tg enthalpy relaxation in milled and quenched As2S3 glasses
Source abstract
Abstract
We investigate the sub-T g relaxation in both the mechanically milled and the quenched As 2S 3 glasses by a differential scanning calorimeter (DSC). The results show that the sub-T g enthalpy relaxation pattern of the milled As 2S 3 glass is similar to that of the quenched glass, but the fictive temperature (T f) of the former is higher than that of the latter. By performing sub-T g annealing, we find that the quenched As 2S 3 glass exhibits the Johari-Goldstein (JG) relaxation, whereas the milled glass shows the relaxation behavior with the activation energy of ~32RT g that deviates from the average value of 24RT g for the JG relaxation. An endotherm occurs prior to the sub-T g relaxation peak when the milled glass undergoes sufficient sub-T g annealing (temperature and time). The occurrence of the endothermic pre-peak and the higher activation energy of the milled glass imply its higher structural heterogeneity compared to the quenched glass. The Raman and X-ray photoelectron spectra indicate the existence of the As 4S 4 clusters and -S-S- chains in both the milled and the quenched glasses, confirming their structural heterogeneity.
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Research context
OpenAlex topics: Phase-change materials and chalcogenides · Glass properties and applications · Material Dynamics and Properties
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