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arXiv 2602.03369cond-mat.mtrl-sciphysics.chem-ph
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利用通用机器学习潜力驱动的结构预测加速复杂材料发现

Accelerating Complex Materials Discovery with Universal Machine-Learning Potential-Driven Structure Prediction

City University of Hong Kong(香港城市大学)

Yuqi An, Zhenbin Wang

AI总结:

本文提出利用通用机器学习潜力驱动的结构预测方法,加速复杂材料发现,展示了其在识别新化合物及验证稳定性预测方面的有效性。

摘要:

通用机器学习 interatomic 潜力(uMLIPs)已成为加速计算材料发现的强大工具,通过在晶体结构预测(CSP)中取代昂贵的原理计算。然而,其在识别新复杂材料的有效性仍存疑。在此,我们系统评估了uMLIP(即M3GNet)在四元氧化物中加速CSP的能力。通过广泛探索Sr-Li-Al-O和Ba-Y-Al-O系统,我们显示uMLIP能够重新发现训练集外已知的材料,并识别出七个新的热力学和动态稳定的化合物。这些包括Sr2LiAlO4的新多形(P3221)和新的无序相Sr2Li4Al2O7(P1_bar)。此外,我们的结果表明基于半局部PBE功能的稳定性预测需要与更高层次的方法如SCAN和RPA交叉验证以确保可靠性。尽管uMLIPs显著降低了CSP的计算成本,但主要瓶颈已转移到在复杂结构空间中导航的搜索算法效率。本工作突显了uMLIP驱动的CSP在新材料发现中的潜力和当前限制。

英文摘要:

Universal machine-learning interatomic potentials (uMLIPs) have become powerful tools for accelerating computational materials discovery by replacing expensive first-principles calculations in crystal structure prediction (CSP). However, their effectiveness in identifying new, complex materials remains uncertain. Here, we systematically assess the capability of a uMLIP (i.e.,M3GNet) to accelerate CSP in quaternary oxides. Through extensive exploration of the Sr-Li-Al-O and Ba-Y-Al-O systems, we show that uMLIP can rediscover experimentally known materials absent from its training set and identify seven new thermodynamically and dynamically stable compounds. These include a new polymorph of Sr2LiAlO4 (P3221) and a new disordered phase, Sr2Li4Al2O7 (P1_bar). Furthermore, our results show stability predictions based on the semilocal PBE functional require cross-validation with higher-level methods, such as SCAN and RPA, to ensure reliability. While uMLIPs substantially reduce the computational cost of CSP, the primary bottleneck has shifted to the efficiency of search algorithms in navigating complex structural spaces. This work highlights both the promise and current limitations of uMLIP-driven CSP in the discovery of new 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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