Ge2Sb2Te5

Name: Ge2Sb2Te5
Diagram No.: 655
Type of diagram: CCT
Chemical composition in weight %: Ge2Sb2Te5
Group: Glasses
Note: GST combined continuous-cooling-transformation (CCT) and time-temperature-transformation (TTT) diagrams and possible optimized routes for the reversible switching cycle. (a) CCT-TTT diagram with data points based on estimated onset and end times for crystallization at the quench rate of -0.45 K/ps, shown as solid symbols, and at different annealing temperatures, shown as open symbols. Dashed black, magenta, blue, and red curves indicate different quench rates. (b) Possible routes to accelerate the amorphization, tailor the amorphous phase, and accelerate the crystallization by using multiple quenching rates and annealing temperatures. Solid curves illustrate the TTT diagram based on the data points shown in (a). The horizontal dashed black lines labeled Tm and Tg indicate the melting temperature 900 K, and the glass transition temperature 428 K, respectively.
Reference: Paulo S. Branicio, et al., Atomistic insights into the nanosecond long amorphization and crystallization cycle of nanoscale Ge2Sb2Te5: An ab initio molecular dynamics study, PHYSICAL REVIEW MATERIALS 2, 043401 (2018), pp. 043401-1 - 043401-10.

Transformation Diagram


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