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
复制标题
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:
影响因子:
--
通讯作者:
Motoyuki Shiga
中科院分区:
文献类型:
--
作者:
Hajime Kimizuka;Bo Thomsen;Motoyuki Shiga
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.
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DOI:
10.1515/zna-1971-0522
发表时间:
1971
期刊:
Zeitschrift für Naturforschung A
影响因子:
--
作者:
J. Völkl;G. Wollenweber;K. Klatt;G. Alefeld
通讯作者:
G. Alefeld
影响因子:
4.4
作者:
M. Shiga;H. Fujisaki
通讯作者:
H. Fujisaki
影响因子:
3.7
作者:
I. Katzarov;A. Paxton;D. Pashov
通讯作者:
D. Pashov
影响因子:
3.7
作者:
H. Kimizuka;S. Ogata
通讯作者:
H. Kimizuka;S. Ogata
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:
--
作者:
G. Sicking;B. Huber
通讯作者:
B. Huber