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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Crystallization kinetics in Se-Te glassy system
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Crystallization kinetics in Se-Te glassy system

机译：Se-Te玻璃态系统的结晶动力学

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摘要

Differential scanning calorimetry measurements were used to study crystallization in the Se_yTe_((1 - y)) glassy system under non-isothermal conditions. The examined compositions were y = 0.1, 0.2 and 0.3. The crystallization kinetics was described in terms of the Johnson-Mehl-Avrami nucleation-growth model. It was found that with the addition of tellurium into the selenium matrix the apparent activation energy of the crystallization process monotonically increases and, more importantly, the parameter of the JMA model m decreases. This change in the crystallization mechanism was interpreted as a gradual crossover from surface to bulk process. Both processes are competitive and proceed simultaneously in glasses with low tellurium content, while in the case of increased Te content the surface crystallization mechanism recedes. The transition between mechanisms was discussed in terms of changes in molecular structure of the material.
机译：差示扫描量热法测量用于研究非等温条件下Se_yTe _（（1- y））玻璃系统的结晶。所检查的组成为y ＝ 0.1、0.2和0.3。用Johnson-Mehl-Avrami成核-生长模型描述了结晶动力学。发现在碲基体中添加碲后，结晶过程的表观活化能单调增加，更重要的是，JMA模型m的参数减小。结晶机理的这种变化被解释为从表面到本体过程的逐渐过渡。在碲含量低的玻璃中，这两种方法都具有竞争优势，并且可以同时进行，而在Te含量增加的情况下，表面结晶机制就会减弱。根据材料分子结构的变化讨论了机理之间的过渡。

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