Physical review letters, 2021-06, Vol.126 (23), p.1-236001, Article 236001
2021
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- Autor(en) / Beteiligte
- Titel
- Phase Diagram of a Deep Potential Water Model
- Ist Teil von
- Physical review letters, 2021-06, Vol.126 (23), p.1-236001, Article 236001
- Ort / Verlag
- College Park: American Physical Society
- Erscheinungsjahr
- 2021
- Quelle
- Free E-Journal (出版社公開部分のみ）
- Beschreibungen/Notizen
- Using the Deep Potential methodology, we construct a model that reproduces accurately the potential energy surface of the SCAN approximation of density functional theory for water, from low temperature and pressure to about 2400 K and 50 GPa, excluding the vapor stability region. The computational efficiency of the model makes it possible to predict its phase diagram using molecular dynamics. Satisfactory overall agreement with experimental results is obtained. The fluid phases, molecular and ionic, and all the stable ice polymorphs, ordered and disordered, are predicted correctly, with the exception of ice III and XV that are stable in experiments, but metastable in the model. The evolution of the atomic dynamics upon heating, as ice VII transforms first into ice VII′′ and then into an ionic fluid, reveals that molecular dissociation and breaking of the ice rules coexist with strong covalent fluctuations, explaining why only partial ionization was inferred in experiments.
- Sprache
- Englisch
- Identifikatoren
- ISSN: 0031-9007eISSN: 1079-7114DOI: 10.1103/PhysRevLett.126.236001Titel-ID: cdi_osti_scitechconnect_1853192
- Format
- –
- Schlagworte
- ATOMIC AND MOLECULAR PHYSICS, Classical statistical mechanics, Density functional theory, First order phase transitions, First-principles calculations, Fluid dynamics, Interatomic & molecular potentials, Low temperature, Machine learning, Molecular dynamics, Phase diagrams, Physical simulation, Physics, Potential energy, Potential energy surfaces, Water