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arXiv 2203.06283cond-mat.mtrl-sciphysics.comp-ph
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稳定Li-Sn化合物的预测:用神经网络势推进从头算搜索

Prediction of stable Li-Sn compounds: boosting ab initio searches with neural network potentials

Saba Kharabadze, Aidan Thorn, Ekaterina A. Koulakova, Aleksey N. Kolmogorov

摘要:

Li-Sn二元系统一直是广泛研究的焦点,因为它具有作为电池阳极的潜在应用的富锂合金。我们目前结合机器学习和从头算方法对二元系统进行的重新研究使我们能够筛选出巨大的配置空间,并发现了一些被忽视的化学稳定合金。在环境压力下,我们的进化搜索确定了一种新的稳定的Li $_3$ Sn相,其具有大的基于BCC的hR 48结构和可能的高T LiSn $_4$基态。通过为观察到的和预测的Li-Sn BCC合金构建一个简单的模型,我们构建了一个甚至更大的可行的hR 75结构,化学计量比为19:6。在20 GPa,新的11:2,5:1,和9:2阶段发现与我们的全球搜索不稳定先前提出的阶段与高锂含量。这些发现展示了机器学习原子间势在加速复杂材料从头算预测方面的可观前景。

英文摘要:

The Li-Sn binary system has been the focus of extensive research because it features Li-rich alloys with potential applications as battery anodes. Our present re-examination of the binary system with a combination of machine learning and ab initio methods has allowed us to screen a vast configuration space and uncover a number of overlooked thermodynamically stable alloys. At ambient pressure, our evolutionary searches identified a new stable Li$_3$Sn phase with a large BCC-based hR48 structure and a possible high-T LiSn$_4$ ground state. By building a simple model for the observed and predicted Li-Sn BCC alloys we constructed an even larger viable hR75 structure at an exotic 19:6 stoichiometry. At 20 GPa, new 11:2, 5:1, and 9:2 phases found with our global searches destabilize previously proposed phases with high Li content. The findings showcase the appreciable promise machine learning interatomic potentials hold for accelerating ab initio prediction of complex 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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