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arXiv 2202.12919cond-mat.mtrl-sci
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一种量化随机固溶体中能量景观统计特性的分析方法

An analytical method to quantify the statistics of energy landscapes in random solid solutions

University of Illinois at Chicago(伊利诺伊大学芝加哥分校)

Ritesh Jagatramka, Chu Wang, Matthew Daly

AI总结:

本文提出一组基于溶质配位环境的解析方程,用于量化随机固溶体中势能景观的统计特性,并通过分子静力学模拟验证了其在预测内聚能与平面缺陷能方面的有效性,为相稳定性提供了新见解。

摘要:

近期关于浓缩固溶体的研究强调了各种溶质相互作用在决定多种介观特性中的作用。这些溶质相互作用表现为势能的空间涨落,源于化学环境的局部变化。尽管文献中关于势能涨落的观察已有充分记录,但确定其统计特性的方法仍然匮乏。在此,我们提出了一组解析方程,用于量化随机排列固溶体中势能景观的统计特性。我们的方法基于将 embedded atom method 的关系以溶质配位环境为参数进行重新参数化。最终的方程具有通用性,只要所研究的系统可以通过一组配位关系来描述,即可应用于不同的晶格和能量景观。我们利用这些统计关系研究了几种不同固溶体的内聚能和广义平面缺陷能量景观。解析预测通过分子静力学模拟进行了验证,在大多数情况下发现两者极好地吻合。该分析的结果为固溶体中的相稳定性和局部平面缺陷能的解释提供了新见解,这些是社区内持续讨论的话题。

英文摘要:

Recent studies of concentrated solid solutions have highlighted the role of varied solute interactions in the determination of a wide variety of mesoscale properties. These solute interactions emerge as spatial fluctuations in potential energy, which arise from local variations in the chemical environment. Although observations of potential energy fluctuations are well documented in the literature, there remains a paucity of methods to determine their statistics. Here, we present a set of analytical equations to quantify the statistics of potential energy landscapes in randomly arranged solid solutions. Our approach is based on a reparameterization of the relations of the embedded atom method in terms of the solute coordination environment. The final equations are general and can be applied to different crystal lattices and energy landscapes, provided the systems of interest can be described by sets of coordination relations. We leverage these statistical relations to study the cohesive energy and generalized planar fault energy landscapes of several different solid solutions. Analytical predictions are validated using molecular statics simulations, which find excellent agreement in most cases. The outcomes of this analysis provide new insights into phase stability and the interpretation of local planar fault energies in solid solutions, which are topics of ongoing discussion within the community.

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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