| ATOMIC AND MOLECULAR PHYSICS |
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Discriminating High-Pressure Water Phases Using Rare-Event Determined Ionic Dynamical Properties |
| Lin Zhuang1,2, Qijun Ye1,2**, Ding Pan3,4, Xin-Zheng Li1,2,5** |
1Institute of Condensed Matter and Material Physics, School of Physics, Peking University, Beijing 100871
2State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Frontier Science Center for Nano-optoelectronics and School of Physics, Peking University, Beijing 100871
3Department of Physics and Department of Chemistry, Hong Kong University of Science and Technology, Hong Kong
4HKUST Fok Ying Tung Research Institute, Guangzhou 511458
5Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871
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| Cite this article: |
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Lin Zhuang, Qijun Ye, Ding Pan et al 2020 Chin. Phys. Lett. 37 043101 |
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Abstract Recent discoveries of dynamic ice VII and superionic ice highlight the importance of ionic diffusions in discriminating high-pressure ($P$) water phases. The rare event nature and the chemical bond breaking associated with these diffusions, however, make extensive simulations of these processes unpractical to ab initio and inappropriate for force field based methods. Using a first-principles neural network potential, we performed a theoretical study of water at 5–70 GPa and 300–3000 K. Long-time dynamics of protons and oxygens were found indispensable in discriminating several subtle states of water, characterized by proton's and oxygen ion's diffusion coefficients and the distribution of proton's displacements. Within dynamic ice VII, two types of proton transfer mechanisms, i.e., translational and rotational transfers, were identified to discriminate this region further into dynamic ice VII T and dynamic ice VII R. The triple point between ice VII, superionic ice (SI), and liquid exists because the loosening of the bcc oxygen skeleton is prevented by the decrease of interatomic distances at high $P$'s. The melting of ice VII above $\sim$40 GPa can be understood as a process of two individual steps: the melting of protons and the retarded melting of oxygens, responsible for the forming of SI. The boundary of the dynamic ice VII and SI lies on the continuation line ice VII's melting curve at low $P$'s. Based on these, a detailed phase diagram is given, which may shed light on studies of water under $P$'s in a wide range of interdisciplinary sciences.
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Received: 07 March 2020
Published: 25 March 2020
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| PACS: |
31.15.xv
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(Molecular dynamics and other numerical methods)
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66.30.jp
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(Proton diffusion)
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81.30.Dz
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(Phase diagrams of other materials)
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07.05.Mh
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(Neural networks, fuzzy logic, artificial intelligence)
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| Fund: Supported by the National Basic Research Program of China under Grant Nos. 2016YFA0300900 and 2017YFA0205003, the National Science Foundation of China under Grant Nos. 11774003, 11634001, 11934003, and 11774072. D. Pan also acknowledges the support from Hong Kong Research Grands Council (Nos. ECS-26305017 and GRF-16307618), the Alfred R. Sloan Foundation through the Deep Carbon Observatory (DCO), and the Croucher Foundation through the Croucher Innovation Award. |
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