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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 a 5BaO center dot 8SiO(2) glass
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Crystallization kinetics in a 5BaO center dot 8SiO(2) glass

机译：5BAO中心点8sio（2）玻璃中的结晶动力学

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摘要

The accuracy of a Differential Thermal Analysis (DTA) technique for predicting the temperature range of significant nucleation is examined in a 5BaO center dot 8SiO(2) glass based on iterative numerical calculations. The diffusion coefficient is calculated from the measured induction time and the crystal growth velocity. The Classical Theory of Nucleation and the Diffuse Interface Theory were used to model crystal nucleation and growth. However, in both theories, two different diffusion coefficients were required for the calculated crystallization peaks to match the measured DTA data. The development of small nuclei near the critical size during nucleation was calculated using the diffusion coefficient from the measured induction time for nucleation. The growth of nuclei much larger than the critical size was determined by the diffusion coefficient from the measured growth velocity. The difference could reflect a complicated nucleation process in which the primary nucleating phase is not the 5BaO center dot 8SiO(2) crystal.
机译：基于迭代数值计算，对5BaO中心点8SiO（2）玻璃中预测显著形核温度范围的差热分析（DTA）技术的准确性进行了检验。扩散系数由测量的诱导时间和晶体生长速度计算得出。用经典成核理论和扩散界面理论模拟晶体的成核和生长。然而，在这两种理论中，计算的结晶峰需要两个不同的扩散系数，以匹配测量的DTA数据。利用测量的成核诱导时间中的扩散系数，计算了成核过程中临界尺寸附近小核的发展。比临界尺寸大得多的核的生长由测量的生长速度的扩散系数决定。这种差异可能反映了一个复杂的成核过程，其中主要成核相不是5BaO中心点8SiO（2）晶体。

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