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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 >On the determination of the kinetic pre-factor in classical nucleation theory
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On the determination of the kinetic pre-factor in classical nucleation theory

机译：关于经典成核理论中动力学因素的确定

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摘要

A critical overview on some basic assumptions of the classical nucleation theory (CNT) in application to segregation and crystal nucleation and growth processes in glass-forming liquids is given. It is shown how the classical theory can be generalized in order to overcome at part serious contradictions between theoretical predictions and experimental data. These generalizations refer both to the method of determination of the work of formation of clusters of sub-, super- and critical sizes and to the way of determination of the coefficients of attachment and the kinetic pre-factor in the expression for the steady-state nucleation rate being essential ingredients of the theoretical description of the processes under consideration. Reviewing briefly recent developments in the methods of determination of the work of critical cluster formation and the understanding of the scenario of phase formation processes, particular attention is devoted here to the analysis of the main kinetic assumptions and related topics in application to phase formation in multi-component glass-forming liquids (determination of the effective diffusion coefficient governing nucleation and growth, estimation of the size of the structural units entering the expression for the steady-state nucleation rate, validity of the Stokes-Einstein relation, etc.). In application to crystal nucleation in multi-component solutions it can be shown that one fairly ambiguous concept, the problem of determination of the size of a structural unit determining the melt-crystal transformation can be widely removed from the description.
机译：对经典成核理论（CNT）在玻璃形成液体中的偏析和晶体成核以及生长过程中的一些基本假设进行了批判性概述。它显示了如何对经典理论进行概括，以部分地克服理论预测和实验数据之间的严重矛盾。这些概括既涉及确定亚尺寸，超尺寸和临界尺寸的簇的形成工作的方法，也涉及确定稳态表达式中的附着系数和动力学前置因子的方法。成核速率是所考虑方法的理论描述的基本要素。简要回顾了确定关键团簇形成方法的最新进展以及对相形成过程情景的理解，在此特别关注对主要动力学假设的分析以及在多相形成中应用的相关主题。组分玻璃形成液（确定成核和生长的有效扩散系数，估计进入稳态成核率表达式的结构单元的大小，斯托克斯-爱因斯坦关系的有效性等）。在应用于多组分溶液中的晶体成核中，可以证明，一个相当模糊的概念可以从描述中广泛地消除确定熔融晶体相变的结构单元的尺寸的确定问题。

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