Resolving glass transition in Te-based phase-change materials by modulated differential scanning calorimetry. (26th September 2017)

• Record Type: Journal Article
• Authors: Chen, Yimin; Mu, Sen; Wang, Guoxiang; Shen, Xiang; Wang, Junqiang; Dai, Shixun; Xu, Tiefeng; Nie, Qiuhua; Wang, Rongping
• Is Part Of: Applied physics express. Volume 10:Number 10(2017)
• Publication Date: 2017-09-26
• Subjects: Physics -- Periodicals; Technology -- Periodicals; 621.05
• DOI: 10.7567/APEX.10.105601
• Languages: English
• ISSNs: 1882-0778

Abstract

Abstract: Glass transitions of Te-based phase-change materials (PCMs) were studied by modulated differential scanning calorimetry. It was found that both Ge2 Sb2 Te5 and GeTe are marginal glass formers with Δ T (= T x − T g ) less than 2.1 °C when the heating rate is below 3 °C min −1 . The fragilities of Ge2 Sb2 Te5 and GeTe can be estimated as 46.0 and 39.7, respectively, around the glass transition temperature, implying that a fragile-to-strong transition would be presented in such Te-based PCMs. The above results provide direct experimental evidence to support the investigation of crystallization kinetics in supercooled liquid PCMs.