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arXiv 2011.07106cond-mat.softcond-mat.stat-mech
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硬球的漏胞模型

Leaky Cell Model of Hard Spheres

Thomas G. Fai, Jamie M. Taylor, Epifanio G. Virga, Xiaoyu Zheng, Peter Palffy-Muhoray

摘要:

研究了格上硬球的填充问题。配分函数,以及由此产生的压强,可以仅仅用可接近的自由体积来表示,即一个球体在不接触另一个球体的情况下可以探索的空间体积。我们计算这些自由体积使用一个漏细胞模型,在该模型中,可访问的空间占的可能性,球体可能会逃离当地的笼子里的晶格邻居。我们描述了如何初等几何可以用来计算自由体积正是这个漏细胞模型在二维和三维晶格填充和比较结果,著名的卡纳汉,Starling和打击乐,Yevick液体模型。我们提供的各种晶格的自由体积的公式,并使用公切线建设,以确定它们之间的几个相变在漏细胞制度,表明共存的可能性在结晶材料。

英文摘要:

We study packings of hard spheres on lattices. The partition function, and therefore the pressure, may be written solely in terms of the accessible free volume, i.e. the volume of space that a sphere can explore without touching another sphere. We compute these free volumes using a leaky cell model, in which the accessible space accounts for the possibility that spheres may escape from the local cage of lattice neighbors. We describe how elementary geometry may be used to calculate the free volume exactly for this leaky cell model in two- and three-dimensional lattice packings and compare the results to the well-known Carnahan-Starling and Percus-Yevick liquid models. We provide formulas for the free volumes of various lattices and use the common tangent construction to identify several phase transitions between them in the leaky cell regime, indicating the possibility of coexistence in crystalline materials.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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