Abstract
Nanoscale phase-change materials (PCMs) are utilized as non-volatile next-generation storage class memory and other applications, and kinetics study becomes an important property for switching in high-temperature regimes. Glass transition kinetics and crystallization kinetics of GeTeSe0.5 glass has been studied theoretically and experimentally by employing differential scanning calorimetry (DSC). DSC curve was recorded on various heating rates (5,10,15,20 K/min). Glass transition activation energy switches as conversion fraction χg changes. The fragility index calculated for GeTeSe0.5 material shows that the composition belongs to strong glass-forming liquid. Theoretical developed model (TDM) and Johnson-Mehl-Avrami (JMA) model have been used for evaluating kinetic parameters. For studied composition, there is heterogeneous nucleation followed by two or three-dimensional crystal growth process by mean values of kinetic exponent factors. Results calculated by different models have been compared with experimental results and it has been noticed that TMD model satisfies with experimentally calculated values.
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