Artificial neural network-based path integral simulations of hydrogen isotope diffusion in palladium

Artificial neural network-based path integral simulations of hydrogen isotope diffusion in palladium
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基于人工神经网络的钯中氢同位素扩散路径积分模拟

DOI:
10.1088/2515-7655/ac7e6b
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发表时间:
2022
期刊:
Journal of Physics: Energy
影响因子:
--
通讯作者:
Motoyuki Shiga
Motoyuki Shiga
中科院分区:
--
文献类型:
--
作者:
Hajime Kimizuka;Bo Thomsen;Motoyuki Shiga

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采用路径积分技术和基于人工神经网络的Pd-H合金原子间相互作用势的机器学习方法,沿着深入研究了面心立方Pd中核量子效应对间隙氢同位素动力学和动力学的贡献.基于量子过渡态理论(QTST)结合路径积分分子动力学模拟,预测了较宽温度范围内(50-1500 K)的氚、氘和氚在钯中的扩散系数(D). NQE的重要性,即使在高温下说明在Pd中的H-同位素迁移的活化自由能的特征温度依赖性。这阐明了Pd中三种H同位素之间异常D交叉的整体情况。此外,在370-1500 K温度范围内,采用基于Feynman路径积分理论的两种近似量子动力学方法,即质心分子动力学(CMD)和环聚合物分子动力学(RPMD),直接计算了Pd中的氘分子的D。从CMD和RPMD模拟获得的D值非常相似,并且在此温度范围内比QTST结果更好地与报道的实验值一致。我们的基于机器学习的路径积分计算阐明了在Arrhenius图上Pd中三种H同位素的D的“反向S”型非线性行为的潜在量子性质。
The contribution of nuclear quantum effects (NQEs) to the kinetics and dynamics of interstitial H isotopes in face-centered cubic Pd was intensively investigated using several path-integral techniques, along with a newly developed machine-learning interatomic potential based on artificial neural networks for Pd–H alloys. The diffusion coefficients (D) of protium, deuterium, and tritium in Pd were predicted over a wide temperature range (50–1500 K) based on quantum transition-state theory (QTST) combined with path-integral molecular-dynamics simulations. The importance of NQEs even at high temperatures was illustrated in terms of the characteristic temperature dependence of the activation free energies for H-isotope migration in Pd. This illuminates the overall picture of anomalous D crossovers among the three H isotopes in Pd. In addition, the D of protium in Pd was directly computed using two approximate quantum-dynamics methods based on Feynman's path-integral theory, ie centroid molecular dynamics (CMD) and ring-polymer molecular dynamics (RPMD), in the temperature range 370–1500 K. The D values obtained from the CMD and RPMD simulations were very similar and agreed better with the reported experimental values than the QTST results in this temperature range. Our machine learning-based path-integral calculations elucidate the underlying quantum nature of the'reversed S'-type nonlinear behavior of D for the three H isotopes in Pd on the Arrhenius plots.
通知:钯中氢扩散的同位素依赖性相反
DOI: 10.1515/zna-1971-0522
发表时间: 1971
期刊: Zeitschrift für Naturforschung A
影响因子: --
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期刊: Physical Review B
影响因子: 3.7
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DOI: 10.1016/0022-5088(80)90187-3
发表时间: 1980
期刊: Journal of The Less Common Metals
影响因子: --
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