Lennard-Jones和Weeks-Chandler-Andersen体系中沿固液共存线的晶体生长动力学
Crystal growth kinetics in Lennard-Jones and Weeks-Chandler-Andersen systems along the solid-liquid coexistence line
摘要：
用非平衡分子动力学模拟研究了Lennard-Jones和Weeks-Chandler-Andersen面心立方晶液界面（100）、（110）和（111）晶向固液共存线上的晶体生长动力学。观察到沿共存线的生长动力学减慢，这主要是温度效应，其他量如熔化压力和液体自扩散系数具有可忽略的影响。这两种潜力的增长动力学变得相似，在大值的熔化温度和压力，当两者都类似于一个纯粹的排斥性软球势。从熔体结晶的经典模型是在合理的定性与我们的模拟数据。最后，研究了几个单相经验熔化/冻结规则沿共存线的有效性。
英文摘要：
Kinetics of crystal-growth is investigated along the solid-liquid coexistence line for the (100), (110) and (111) orientations of the Lennard-Jones and Weeks-Chandler-Andersen fcc crystal-liquid interface, using non-equilibrium molecular dynamics simulations. A slowing down of the growth kinetics along the coexistence line is observed, which is mostly a temperature effect, with other quantities such as the melting pressure and liquid self-diffusion coefficient having a negligible impact. The growth kinetics of the two potentials become similar at large values of the melting temperature and pressure, when both resemble a purely repulsive soft-sphere potential. Classical models of crystallization from the melt are in reasonable qualitative agreement with our simulation data. Finally, several one-phase empirical melting/freezing rules are studied with respect to their validity along the coexistence line.
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