| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Dynamic Crossover in Metallic Glass Nanoparticles |
| Shan Zhang1, Weihua Wang2, and Pengfei Guan1* |
1Beijing Computational Science Research Center, Beijing 100193, China
2Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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| Cite this article: |
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Shan Zhang, Weihua Wang, and Pengfei Guan 2021 Chin. Phys. Lett. 38 016802 |
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Abstract We report the dynamic crossover behavior in metallic glass nanoparticles (MGNs) with the size reduction based on the extensive molecular dynamics (MD) simulations combined with the activation-relaxation technique (ART). The fragile-to-strong transition of dynamics can be achieved by just modulating the characteristic size of MGNs. It can be attributed to the abnormal fast surface dynamics enhanced by the surface curvature. By determining the potential energy surface, we reveal the hierarchy-to-flat transition of potential energy landscape (PEL) in MGNs, and demonstrate the intrinsic flat potential landscape feature of the MGN with size smaller than a critical size. Our results provide an important piece of the puzzle about the size-modulated potential energy landscape and shed some lights on the unique properties of MGs in nanoscale.
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Received: 09 December 2020
Published: 29 December 2020
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| PACS: |
60.70.pe
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64.70.ph
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(Nonmetallic glasses (silicates, oxides, selenides, etc.))
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68.35.Ja
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(Surface and interface dynamics and vibrations)
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| Fund: Supported by the Science Challenge Project (Grant No. TZ2018004), and the National Natural Science Foundation of China (Grant No. U1930402). S.Z. and P.G. acknowledge the computational support from the Beijing Computational Science Research Center (CSRC). |
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