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Deiters UK, Sadus RJ. An intermolecular potential for hydrogen: Classical molecular simulation of pressure-density-temperature behavior, vapor-liquid equilibria, and critical and triple point properties. J Chem Phys 2023; 158:2890478. [PMID: 37184016 DOI: 10.1063/5.0148248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Accepted: 04/25/2023] [Indexed: 05/16/2023] Open
Abstract
An intermolecular potential is reported for molecular hydrogen that combines two-body interactions from ab initio data with three-body interactions. The accuracy of the two-body potential is validated by comparison with experimental second virial coefficient data. Experimental pressure-density-temperature data are used to validate the addition of three-body interactions, often yielding very accurate predictions. Classical Monte Carlo simulations that neglect quantum effects are reported for the vapor-liquid equilibria (VLE), critical properties, and the triple point. A comparison with experimental data indicates that the effect of quantum interactions is to narrow the VLE phase envelope and to lower the critical temperature. The three-body interactions have a considerable influence on the phase behavior, resulting in good agreement with the experimental density. The critical properties of the two-body + three-body potential for hydrogen provide an alternative set of input parameters to improve the accuracy of theoretical predictions at temperatures above 100 K. In the vicinity of the critical point, the coexistence densities do not obey the law of rectilinear diameters, which is a feature that has largely been overlooked in both experimental data and reference equations of state.
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Affiliation(s)
- Ulrich K Deiters
- Institute of Physical Chemistry, Faculty of Mathematics and Natural Sciences, University of Cologne, Greinstr 4-6, D-50939 Köln, Germany
| | - Richard J Sadus
- Department of Computer Technologies, Swinburne University of Technology, Wurundjeri Country, P.O. Box 218, Hawthorn, Victoria 3122, Australia
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2
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High-pressure synthesis of seven lanthanum hydrides with a significant variability of hydrogen content. Nat Commun 2022; 13:6987. [DOI: 10.1038/s41467-022-34755-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Accepted: 11/04/2022] [Indexed: 11/18/2022] Open
Abstract
AbstractThe lanthanum-hydrogen system has attracted significant attention following the report of superconductivity in LaH10 at near-ambient temperatures and high pressures. Phases other than LaH10 are suspected to be synthesized based on both powder X-ray diffraction and resistivity data, although they have not yet been identified. Here, we present the results of our single-crystal X-ray diffraction studies on this system, supported by density functional theory calculations, which reveal an unexpected chemical and structural diversity of lanthanum hydrides synthesized in the range of 50 to 180 GPa. Seven lanthanum hydrides were produced, LaH3, LaH~4, LaH4+δ, La4H23, LaH6+δ, LaH9+δ, and LaH10+δ, and the atomic coordinates of lanthanum in their structures determined. The regularities in rare-earth element hydrides unveiled here provide clues to guide the search for other synthesizable hydrides and candidate high-temperature superconductors. The hydrogen content variability in lanthanum hydrides and the samples’ phase heterogeneity underline the challenges related to assessing potentially superconducting phases and the nature of electronic transitions in high-pressure hydrides.
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Peña-Alvarez M, Binns J, Marqués M, Kuzovnikov MA, Dalladay-Simpson P, Pickard CJ, Ackland GJ, Gregoryanz E, Howie RT. Chemically Assisted Precompression of Hydrogen Molecules in Alkaline-Earth Tetrahydrides. J Phys Chem Lett 2022; 13:8447-8454. [PMID: 36053162 PMCID: PMC9488899 DOI: 10.1021/acs.jpclett.2c02157] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Accepted: 08/12/2022] [Indexed: 06/15/2023]
Abstract
Through a series of high pressure diamond anvil experiments, we report the synthesis of alkaline earth (Ca, Sr, Ba) tetrahydrides, and investigate their properties through Raman spectroscopy, X-ray diffraction, and density functional theory calculations. The tetrahydrides incorporate both atomic and quasi-molecular hydrogen, and we find that the frequency of the intramolecular stretching mode of the H2δ- units downshifts from Ca to Sr and to Ba upon compression. The experimental results indicate that the larger the host cation, the longer the H2δ- bond. Analysis of the electron localization function (ELF) demonstrates that the lengthening of the H-H bond is caused by the charge transfer from the metal to H2δ- and by the steric effect of the metal host on the H-H bond. This effect is most prominent for BaH4, where the precompression of H2δ- units at 50 GPa results in bond lengths comparable to that of pure H2 above 275 GPa.
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Affiliation(s)
- Miriam Peña-Alvarez
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
| | - Jack Binns
- Center
for High Pressure Science and Technology Advanced Research, Shanghai 100094, P. R. China
| | - Miriam Marqués
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
| | - Mikhail A. Kuzovnikov
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
| | - Philip Dalladay-Simpson
- Center
for High Pressure Science and Technology Advanced Research, Shanghai 100094, P. R. China
| | - Chris J. Pickard
- Department
of Materials Science and Metallurgy, University
of Cambridge, Cambridge CB3 0FS, U.K.
- Advanced
Institute for Materials Research, Tohoku
University, Sendai 980-8577, Japan
| | - Graeme J. Ackland
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
| | - Eugene Gregoryanz
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
- Center
for High Pressure Science and Technology Advanced Research, Shanghai 100094, P. R. China
- Key Laboratory
of Materials Physics, Institute of Solid
State Physics, Hefei 230031, P. R. China
| | - Ross T. Howie
- Centre
for Science at Extreme Conditions and School of Physics and Astronomy, University of Edinburgh, Edinburgh EH9 3FD, U.K.
- Center
for High Pressure Science and Technology Advanced Research, Shanghai 100094, P. R. China
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Laniel D, Fedotenko T, Winkler B, Aslandukova A, Aslandukov A, Aprilis G, Chariton S, Milman V, Prakapenka V, Dubrovinsky L, Dubrovinskaia N. A reentrant phase transition and a novel polymorph revealed in high-pressure investigations of CF4 up to 46.5 GPa. J Chem Phys 2022; 156:044503. [DOI: 10.1063/5.0079402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Dominique Laniel
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Timofey Fedotenko
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Bjoern Winkler
- Institut für Geowissenschaften, Abteilung Kristallographie, Johann Wolfgang Goethe-Universität Frankfurt, Altenhöferallee 1, D-60438 Frankfurt am Main, Germany
| | - Alena Aslandukova
- Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany
| | - Andrey Aslandukov
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
| | - Georgios Aprilis
- The European Synchrotron Radiation Facility, 38043 Grenoble Cedex 9, France
| | - Stella Chariton
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Victor Milman
- Dassault Systèmes BIOVIA, CB4 0WN Cambridge, United Kingdom
| | - Vitali Prakapenka
- Center for Advanced Radiation Sources, University of Chicago, Chicago, Illinois 60637, USA
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth, 95440 Bayreuth, Germany
| | - Natalia Dubrovinskaia
- Material Physics and Technology at Extreme Conditions, Laboratory of Crystallography, University of Bayreuth, 95440 Bayreuth, Germany
- Department of Physics, Chemistry and Biology (IFM), Linköping University, SE-581 83 Linköping, Sweden
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