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Crystal Structure Prediction of Binary Alloys via Deep Potential

Journal Article · · Frontiers in Chemistry
 [1];  [2];  [3];  [4]
  1. Hefei Univ. of Technology (China). School of Electronic Science and Applied Physics; Princeton Univ., NJ (United States)
  2. Peking Univ., Beijing (China). Yuanpei College; Peking Univ., Beijing (China). Beijing Inst. of Big Data Research
  3. Princeton Univ., NJ (United States). Program in Applied and Computational Mathematics
  4. Inst. of Applied Physics and Computational Mathematics, Beijing (China). Lab. of Computational Physics
Predicting crystal structure has been a challenging problem in physics and materials science for a long time. A reliable energy calculation engine combined with an efficient global search algorithm, such as particle swarm optimization algorithm or genetic algorithm, is needed to conduct crystal structure prediction. In recent years, machine learning-based interatomic potential energy surface models have been proposed, potentially allowing us to perform crystal structure prediction for systems with the accuracy of density functional theory (DFT) and the speed of empirical force fields. In this paper, we employ a previously developed Deep Potential model to predict the intermetallic compound of the aluminum–magnesium system, and find six meta-stable phases with negative or nearly zero formation energy. In particular, Mg12Al8 shows excellent ductility and Mg5Al27 has a high Young's modulus. Based on our benchmark results, we propose a relatively robust structure screening criterion that selects potentially stable structures from the Deep Potential-based convex hull and performs DFT refinement. By using this criterion, the computational cost needed to construct the convex hull with ab initio accuracy can be dramatically reduced.
Research Organization:
Princeton Univ., NJ (United States)
Sponsoring Organization:
National Key R&D Foundation of China; National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC)
Grant/Contract Number:
SC0019394
OSTI ID:
1853193
Journal Information:
Frontiers in Chemistry, Journal Name: Frontiers in Chemistry Vol. 8; ISSN 2296-2646
Publisher:
Frontiers Research FoundationCopyright Statement
Country of Publication:
United States
Language:
English

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