Time-dependent nucleation rate measurements in BaO•2SiO2 and 5BaO•8SiO2 glasses
Time-dependent nucleation rate measurements in BaO•2SiO2 and 5BaO•8SiO2 glasses
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DOI：
10.1016/j.jnoncrysol.2019.119575
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发表时间：
2019-12-01
影响因子：
3.5
通讯作者：
Kelton, K. F.
中科院分区：
文献类型：
--
作者：
Xia, Xinsheng;Van Hoesen, D. C.;Kelton, K. F.
用两步热处理法测量了BaO中心点2SiO(2)和5BaO中心点8SiO(2)玻璃的稳态晶核率和诱导时间随温度的变化。对于这两种玻璃，最大成核速率的温度和显著成核的温度范围与之前差热分析研究的估计值吻合得很好。用一种新的迭代方法对数据进行了分析，得到了团簇形成的界面自由能和临界功随温度的变化。当温度低于稳态形核速率最大值时，团簇形成的临界功明显偏离经典形核理论的预期。
The two-step heat treatment method is used to measure the steady state crystal nucleation rate and induction time as a function of temperature in BaO center dot 2SiO(2) and 5BaO center dot 8SiO(2) glasses. For both glasses, the temperature for maximum nucleation rate and the temperature range for significant nucleation agree well with previous estimates from differential thermal analysis studies. The data are analyzed with a new iterative method to obtain the interfacial free energy and critical work of cluster formation as a function of temperature. For temperatures below the temperature at which steady-state nucleation rate is a maximum, the critical work of cluster formation is shown to strongly deviate from expectations of the classical theory of nucleation.