Study of glass transition kinetics of As2S3 and As2Se3 by ultrafast differential scanning calorimetry**Project supported by the National Natural Science Foundation of China (Grant Nos. 61775111, 61775109, and 51771216), the Natural Science Foundation of Zhejiang Province, China (Grant No. LR18E010002), the International Cooperation Project of Ningbo City (Grant No. 2017D10009), the One Hundred Talents Program of Chinese Academy of Sciences,

Abstract

Ultrafast differential scanning calorimetry (DSC) was employed to investigate the glass transition kinetics of As2S3 and As2Se3. By using the Arrhenius method, a fragility index of ∼22 can be estimated in both As2S3 and As2Se3. However, when the scanning rate is more than , non-Arrhenius behavior can be observed in such “strong” liquids where the Vogel–Fulcher method is more accurate to describe the glass transition kinetics. The fragilities of As2S3 and As2Se3 glasses are thus extrapolated as 28.3 ± 1.94 and 23.7 ± 1.80, respectively. This indicates that, As2Se3 glass has a better structural stability and it is a better candidate for device applications.