Crystallization kinetics in a 5BaO·8SiO2 glass

Crystallization kinetics in a 5BaO·8SiO2 glass
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5BaO·8SiO2 玻璃的结晶动力学

DOI:
10.1016/j.jnoncrysol.2020.120479
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发表时间:
2021
影响因子:
3.5
通讯作者:
Kelton, K.F.
Kelton, K.F.
中科院分区:
材料科学2区
文献类型:
--
作者:
Van Hoesen, D.C.;Xia, Xinsheng;McKenzie, Matthew E.;Kelton, K.F.

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基于迭代数值计算,考察了差热分析(DTA)技术预测5BaO·8SiO2玻璃显著形核温度范围的准确性。扩散系数由测量的诱导时间和晶体生长速度计算。采用经典成核理论和扩散界面理论对晶体的成核和生长进行了模拟。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来匹配测量的DTA数据。在成核过程中的临界尺寸附近的小核的发展计算从测得的成核诱导时间的扩散系数。核的生长远大于临界尺寸,由测量的生长速度的扩散系数确定。这种差异反映了一个复杂的形核过程,其中主要的形核相不是5BaO·8SiO2晶体。
The accuracy of a Differential Thermal Analysis (DTA) technique for predicting the temperature range of significant nucleation is examined in a 5BaO·8SiO2glass 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·8SiO2crystal.
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DOI: --
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