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arXiv 2103.06565cond-mat.mtrl-scicond-mat.softphysics.app-ph
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相变材料AIST的玻璃化转变及其对结晶的影响

Glass Transition of the Phase Change Material AIST and its Impact on Crystallization

Julian Pries, Julia Sehringer, Shuai Wei, Pierre Lucas, Matthias Wuttig

摘要:

工程相变材料(PCM),以实现卓越的数据存储设备需要详细了解结晶动力学及其温度依赖性。从玻璃相结晶和从过冷液体(UCL)结晶的温度依赖性明显不同。因此,了解结晶发生的相对于预测切换能力是必要的。在这里,我们测量的玻璃态动力学和结晶动力学使用量热法的加热速率跨越六个数量级。我们的研究结果表明,突出的PCM(Ag,In)掺杂的Sb 2 Te(AIST)表现出从玻璃相结晶从UCL结晶在5,000 K/s的临界升温速率的变化。在玻璃化转变以上,结晶的活化能急剧变化,使得能够在升高的温度下快速结晶。

英文摘要:

Engineering phase change materials (PCM) to realize superior data storage devices requires a detailed understanding of crystallization kinetics and its temperature dependence. The temperature dependence of crystallization differs distinctly between crystallizing from the glassy phase and the undercooled liquid (UCL). Hence, knowing the phase from which crystallization occurs is necessary for predicting the switching ability. Here, we measure the glassy dynamics and crystallization kinetics using calorimetry for heating rates spanning over six orders of magnitude. Our results show that the prominent PCM (Ag,In)-doped Sb2Te (AIST) exhibits a change from crystallizing from the glassy phase to crystallizing from the UCL at a critical heating rate of 5,000 K/s. Above the glass transition, the activation energy of crystallization changes drastically enabling rapid crystallization at elevated temperatures.

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