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Ranieri U, Di Cataldo S, Rescigno M, Monacelli L, Gaal R, Santoro M, Andriambariarijaona L, Parisiades P, De Michele C, Bove LE. Observation of the most H 2-dense filled ice under high pressure. Proc Natl Acad Sci U S A 2023; 120:e2312665120. [PMID: 38109537 PMCID: PMC10756306 DOI: 10.1073/pnas.2312665120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Accepted: 10/30/2023] [Indexed: 12/20/2023] Open
Abstract
Hydrogen hydrates are among the basic constituents of our solar system's outer planets, some of their moons, as well Neptune-like exo-planets. The details of their high-pressure phases and their thermodynamic conditions of formation and stability are fundamental information for establishing the presence of hydrogen hydrates in the interior of those celestial bodies, for example, against the presence of the pure components (water ice and molecular hydrogen). Here, we report a synthesis path and experimental observation, by X-ray diffraction and Raman spectroscopy measurements, of the most H[Formula: see text]-dense phase of hydrogen hydrate so far reported, namely the compound 3 (or C[Formula: see text]). The detailed characterisation of this hydrogen-filled ice, based on the crystal structure of cubic ice I (ice I[Formula: see text]), is performed by comparing the experimental observations with first-principles calculations based on density functional theory and the stochastic self-consistent harmonic approximation. We observe that the extreme (up to 90 GPa and likely beyond) pressure stability of this hydrate phase is due to the close-packed geometry of the hydrogen molecules caged in the ice I[Formula: see text] skeleton.
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Affiliation(s)
- Umbertoluca Ranieri
- Dipartimento di Fisica, Sapienza Università di Roma, 00185Roma, Italy
- Centre for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, EH9 3FDEdinburgh, United Kingdom
| | - Simone Di Cataldo
- Dipartimento di Fisica, Sapienza Università di Roma, 00185Roma, Italy
- Institut für Festkörperphysik, Technische Universität Wien, 1040Wien, Austria
| | - Maria Rescigno
- Dipartimento di Fisica, Sapienza Università di Roma, 00185Roma, Italy
- Laboratory of Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015Lausanne, Switzerland
| | - Lorenzo Monacelli
- Theory and Simulation of Materials, and National Centre for Computational Design and Discovery of Novel Materials, École Polytechnique Fédérale de Lausanne, 1015Lausanne, Switzerland
| | - Richard Gaal
- Laboratory of Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015Lausanne, Switzerland
| | - Mario Santoro
- Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica, CNR-INO, Sesto Fiorentino, 50019, Italy
- European Laboratory for Nonlinear Spectroscopy, LENS, Sesto Fiorentino (FI), 50019, Italy
| | - Leon Andriambariarijaona
- Sorbonne Université, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, 75252Paris, France
| | - Paraskevas Parisiades
- Sorbonne Université, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, 75252Paris, France
| | | | - Livia Eleonora Bove
- Dipartimento di Fisica, Sapienza Università di Roma, 00185Roma, Italy
- Laboratory of Quantum Magnetism, Institute of Physics, École Polytechnique Fédérale de Lausanne, CH-1015Lausanne, Switzerland
- Sorbonne Université, UMR CNRS 7590, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, 75252Paris, France
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Conway LJ, Brown K, Loveday JS, Hermann A. Ammonium fluoride's analogy to ice: Possibilities and limitations. J Chem Phys 2021; 154:204501. [PMID: 34241159 DOI: 10.1063/5.0048516] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Ammonium fluoride, NH4F, is often seen as an analog to ice, with several of its solid phases closely resembling known ice phases. While its ionic and hydrogen-ordered nature puts topological constraints on the ice-like network structures it can form, it is not clear what consequences these constraints have for NH4F compound formation and evolution. Here, we explore computationally the reach and eventual limits of the ice analogy for ammonium fluoride. By combining data mining of known and hypothetical ice networks with crystal structure prediction and density functional calculations, we explore the high-pressure phase diagram of NH4F and host-guest compounds of its hydrides. Pure NH4F departs from ice-like behavior above 80 GPa with the emergence of close-packed ionic structures. The predicted stability of NH4F hydrides shows that NH4F can act as a host to small guest species, albeit in a topologically severely constraint configuration space. Finally, we explore the binary NH3-HF chemical space, where we find candidate structures for several unsolved polyfluoride phases; among them is the chemical analog to H2O2 dihydrate.
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Affiliation(s)
- L J Conway
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - K Brown
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - J S Loveday
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - A Hermann
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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Massani B, Conway LJ, Hermann A, Loveday J. On a new nitrogen sX hydrate from ice XVII. J Chem Phys 2019; 151:104305. [DOI: 10.1063/1.5100868] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- B. Massani
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - L. J. Conway
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - A. Hermann
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - J. Loveday
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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Abstract
Methane and other hydrocarbons are major components of the mantle regions of icy planets. Several recent computational studies have investigated the high-pressure behaviour of specific hydrocarbons. To develop a global picture of hydrocarbon stability, to identify relevant decomposition reactions, and probe eventual formation of diamond, a complete study of all hydrocarbons is needed. Using density functional theory calculations we survey here all known C-H crystal structures augmented by targeted crystal structure searches to build hydrocarbon phase diagrams in the ground state and at elevated temperatures. We find that an updated pressure-temperature phase diagram for methane is dominated at intermediate pressures by CH 4 :H 2 van der Waals inclusion compounds. We discuss the P-T phase diagram for CH and CH 2 (i.e., polystyrene and polyethylene) to illustrate that diamond formation conditions are strongly composition dependent. Finally, crystal structure searches uncover a new CH 4 (H 2 ) 2 van der Waals compound, the most hydrogen-rich hydrocarbon, stable between 170 and 220 GPa.
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Naden Robinson V, Marqués M, Wang Y, Ma Y, Hermann A. Novel phases in ammonia-water mixtures under pressure. J Chem Phys 2018; 149:234501. [DOI: 10.1063/1.5063569] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
- Victor Naden Robinson
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - Miriam Marqués
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
| | - Yanchao Wang
- State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Innovation Center for Computational Physics Methods and Software, College of Physics, Jilin University, Changchun 130012, China
| | - Yanming Ma
- State Key Laboratory for Superhard Materials, College of Physics, Jilin University, Changchun 130012, China
- Innovation Center for Computational Physics Methods and Software, College of Physics, Jilin University, Changchun 130012, China
- International Center for Future Science, Jilin University, Changchun 130012, China
| | - Andreas Hermann
- Centre for Science at Extreme Conditions and SUPA, School of Physics and Astronomy, The University of Edinburgh, Edinburgh EH9 3FD, United Kingdom
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