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arXiv 2006.16588cond-mat.mtrl-sci
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汽-液-固共存与相变的最小相场晶体模拟

Minimal phase-field crystal modeling of vapor-liquid-solid coexistence and transitions

Zi-Le Wang, Zhirong Liu, Zhi-Feng Huang, Wenhui Duan

摘要:

基于密度场方法,结合高阶粒子间直接关联,建立了一个相场晶体模型,用于研究汽液固共存和相变。系统地分析了实现相共存和过渡序列的条件,并通过广泛的模型参数证明了该模型的高度灵活性和适用性。确定了温度-密度和温度-压力相图,同时通过动力学模拟研究了三相之间的结构演化和共存。该模型还能够产生一些温度和压力相关的材料特性,包括热膨胀和压力对平衡晶格间距的影响,以及饱和蒸汽压的温度依赖性。该模型可作为研究气-固、液-固、气-液-固等多种材料生长和沉积过程的有效途径。

英文摘要:

A phase-field crystal model based on the density-field approach incorporating high-order interparticle direct correlations is developed to study vapor-liquid-solid coexistence and transitions within a single continuum description. Conditions for the realization of the phase coexistence and transition sequence are systematically analyzed and shown to be satisfied by a broad range of model parameters, demonstrating the high flexibility and applicability of the model. Both temperature-density and temperature-pressure phase diagrams are identified, while structural evolution and coexistence among the three phases are examined through dynamical simulations. The model is also able to produce some temperature and pressure related material properties, including effects of thermal expansion and pressure on equilibrium lattice spacing, and temperature dependence of saturation vapor pressure. This model can be used as an effective approach for investigating a variety of material growth and deposition processes based on vapor-solid, liquid-solid, and vapor-liquid-solid growth.

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