RE-EXAMINATION OF THE TEMPERATURE-DEPENDENCE OF THE CLASSICAL NUCLEATION RATE - HOMOGENEOUS CRYSTAL NUCLEATION IN GLASS
RE-EXAMINATION OF THE TEMPERATURE-DEPENDENCE OF THE CLASSICAL NUCLEATION RATE - HOMOGENEOUS CRYSTAL NUCLEATION IN GLASS
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DOI：
10.1016/0022-3093(89)90337-2
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发表时间：
1989-02-01
影响因子：
3.5
通讯作者：
ZANOTTO, ED
中科院分区：
文献类型：
--
作者：
WEINBERG, MC;ZANOTTO, ED
实验测定和预测（经典成核理论）的玻璃中的均匀晶体成核率的温度依赖性之间的比较。分析了几种玻璃形成系统的文献数据。它表明，调用的标准假设，以取代跨液晶界面，ΔGD，有利于一个更容易测量的参数（粘度）的自由能传输的激活是不需要的。结果表明，通过确定形核过渡时间与温度的关系，可以在实验上找到Δ GD。此外，它示出，精确的热力学数据不一定是必需的，以使理论预测和实验确定的成核速率的温度变化之间的比较。得出的结论是，经典的均匀形核速率的温度依赖性仍然是一个有争议的问题。
A comparison is made between the experimentally determined and predicted (Classical Nucleation Theory) temperature dependence of the homogeneous crystal nucleation rate in glass. Literature data for several glass-forming systems are analyzed. It is shown that the standard assumptions which are invoked to replace the free energy of activation for transport across the liquid-crystal interface,ΔGD, in favor of a more easily measured parameter (viscosity) are not required. It is demonstrated thatΔGDmay be found experimentally by determining the temperature dependence of the nucleation transient time. Furthermore, it is shown that precise thermodynamic data are not necessarily required in order to make comparisons between the theoretically predicted and experimentally determined temperature variation of the nucleation rate. It is concluded that the temperature dependence of the classical homogeneous nucleation rate is still a matter of controversy.