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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 >Thermal analysis of repetitive single crystallization events in glass-forming liquids at low undercooling
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Thermal analysis of repetitive single crystallization events in glass-forming liquids at low undercooling

机译：低过冷却玻璃形成液中重复单晶事件的热分析

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摘要

Thermal analyses of 284 repetitive single crystallization events were carried out. In particular, the isothermal liquid-to-crystal transformation kinetics of Poisson-distributed and non-Gaussian shaped exothermic DSC signals are calculated individually and by superimposition. It is found that modes of impingement for anisotropic growth, random and regular dispersions fail to accurately predict the growth exponent if a single crystal or a low number of crystals are growing. Non-stationary effects are evident at low and large crystal fractions which diminish when virtual signals of multiple crystallization events are superimposed. The results show that the precise analytic formulation to calculate the degree of transformation relies on an ensemble of crystals growing simultaneously. Where this is not the case, as in glass-forming liquids cooled from above liquidus temperature, the proper approach is to use a time-averaged signal of repetitive crystallization runs.
机译：进行了284重复单晶事件的热分析。 特别地，泊松分布的等温液 - 晶体转化动力学和非高斯形放热DSC信号单独计算，并通过叠加来计算。 发现各向异性生长，随机和常规分散体的冲击模式不能准确地预测单晶或少量晶体的生长指数。 当多个结晶事件的虚拟信号叠加时，在低和大的晶体级分在低和大的晶体级分中是显而易见的。 结果表明，计算转化程度的精确分析制剂依赖于同时生长的晶体的整体。 在不是这种情况下，如在从上方液体温度冷却的玻璃形成液体中，正确的方法是使用重复结晶运行的时间平均信号。

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