1
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Oh H, Tumanov N, Ban V, Li X, Richter B, Hudson MR, Brown CM, Iles GN, Wallacher D, Jorgensen SW, Daemen L, Balderas-Xicohténcatl R, Cheng Y, Ramirez-Cuesta AJ, Heere M, Posada-Pérez S, Hautier G, Hirscher M, Jensen TR, Filinchuk Y. Small-pore hydridic frameworks store densely packed hydrogen. Nat Chem 2024; 16:809-816. [PMID: 38321236 PMCID: PMC11087247 DOI: 10.1038/s41557-024-01443-x] [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: 12/16/2021] [Accepted: 01/08/2024] [Indexed: 02/08/2024]
Abstract
Nanoporous materials have attracted great attention for gas storage, but achieving high volumetric storage capacity remains a challenge. Here, by using neutron powder diffraction, volumetric gas adsorption, inelastic neutron scattering and first-principles calculations, we investigate a magnesium borohydride framework that has small pores and a partially negatively charged non-flat interior for hydrogen and nitrogen uptake. Hydrogen and nitrogen occupy distinctly different adsorption sites in the pores, with very different limiting capacities of 2.33 H2 and 0.66 N2 per Mg(BH4)2. Molecular hydrogen is packed extremely densely, with about twice the density of liquid hydrogen (144 g H2 per litre of pore volume). We found a penta-dihydrogen cluster where H2 molecules in one position have rotational freedom, whereas H2 molecules in another position have a well-defined orientation and a directional interaction with the framework. This study reveals that densely packed hydrogen can be stabilized in small-pore materials at ambient pressures.
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Affiliation(s)
- Hyunchul Oh
- Department of Chemistry, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
- Graduate School of Carbon Neutrality, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea
| | - Nikolay Tumanov
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Voraksmy Ban
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Xiao Li
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium
| | - Bo Richter
- Department of Chemistry and Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark
| | - Matthew R Hudson
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Craig M Brown
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, USA
| | - Gail N Iles
- Department of Crystallography, Helmholtz-Zentrum Berlin, Berlin, Germany
- School of Science, RMIT University, Melbourne, Victoria, Australia
| | - Dirk Wallacher
- Department of Crystallography, Helmholtz-Zentrum Berlin, Berlin, Germany
| | - Scott W Jorgensen
- Chemical and Environmental Sciences Lab, General Motors R&D Center, Warren, MI, USA
- Hyrax intercontinental, Bloomfield, MI, USA
| | - Luke Daemen
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Yongqiang Cheng
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Michael Heere
- Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen and Heinz Maier-Leibnitz Zentrum (MLZ), Technische Universität München, Garching, Germany
- Technische Universität Braunschweig, Institute of Internal Combustion Engines, Braunschweig, Germany
| | - Sergio Posada-Pérez
- Institut de Química Computacional i Catàlisi, Departament de Química, Universitat de Girona, Girona, Catalonia, Spain
| | - Geoffroy Hautier
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium
- Thayer School of Engineering, Dartmouth College, Hanover, NH, USA
| | - Michael Hirscher
- Max Planck Institute for Intelligent Systems, Stuttgart, Germany.
- Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai, Japan.
| | - Torben R Jensen
- Department of Chemistry and Interdisciplinary Nanoscience Center, Aarhus University, Aarhus, Denmark.
| | - Yaroslav Filinchuk
- Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Louvain-la-Neuve, Belgium.
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2
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The Crystal Structure of Carbonic Acid. INORGANICS 2022. [DOI: 10.3390/inorganics10090132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Ubiquitous carbonic acid, H2CO3, a key molecule in biochemistry, geochemistry, and also extraterrestrial chemistry, is known from a plethora of physicochemical studies. Its crystal structure has now been determined from neutron-diffraction data on a deuterated sample in a specially built hybrid clamped cell. At 1.85 GPa, D2CO3 crystallizes in the monoclinic space group P21/c with a = 5.392(2), b = 6.661(4), c = 5.690(1) Å, β = 92.66(3)°, Z = 4, with one symmetry-inequivalent anti-anti shaped D2CO3 molecule forming dimers, as previously predicted. Quantum chemistry evidences π bonding within the CO3 molecular core, very strong hydrogen bonding between the molecules, and a massive influence of the crystal field on all bonds; phonon calculations emphasize the locality of the vibrations, being rather insensitive to the extended structure.
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3
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Peña-Alvarez M, Afonina V, Dalladay-Simpson P, Liu XD, Howie RT, Cooke PIC, Magdau IB, Ackland GJ, Gregoryanz E. Quantitative Rotational to Librational Transition in Dense H 2 and D 2. J Phys Chem Lett 2020; 11:6626-6631. [PMID: 32674573 DOI: 10.1021/acs.jpclett.0c01736] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Raman spectroscopy demonstrates that the rotational spectrum of solid hydrogen, and its isotope deuterium, undergoes profound transformations upon compression while still remaining in phase I. We show that these changes are associated with a loss of quantum character in the rotational modes and that the angular momentum J gradually ceases to be a good quantum rotational number. Through isotopic comparisons of the rotational Raman contributions, we reveal that hydrogen and deuterium evolve from a quantum rotor to a harmonic oscillator. We find that the mechanics behind this transformation can be well-described by a quantum-mechanical single inhibited rotor, accurately reproducing the striking spectroscopic changes observed in phase I.
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Affiliation(s)
- Miriam Peña-Alvarez
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Veronika Afonina
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Philip Dalladay-Simpson
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
| | - Xiao-Di Liu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Ross T Howie
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
| | - Peter I C Cooke
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Ioan B Magdau
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Graeme J Ackland
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
| | - Eugene Gregoryanz
- Centre for Science at Extreme Conditions & The School of Physics and Astronomy, The University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, U.K
- Center for High Pressure Science & Technology Advanced Research, 1690 Cailun Road, Shanghai 201203, P. R. China
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
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4
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Lu Y, Zheng F, Yang W, Kang W, Li Z, Wang C, Gu Z, Tan F, Zhao J, Liu C, Sun C, Zhang P. Temperature effect on the phase stability of hydrogen C2/ cphase from first-principles molecular dynamics calculations. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:405404. [PMID: 32512558 DOI: 10.1088/1361-648x/ab9a7b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 06/08/2020] [Indexed: 06/11/2023]
Abstract
The structural stability of hydrogenC2/cphase from 0 K to 300 K is investigated by combining the first-principles molecular dynamics (MD) simulations and density functional perturbation theory. Without considering the temperature effect, theC2/cphase is stable from 150 GPa to 250 GPa based on the harmonic phonon dispersion relations. The hydrogen molecules at the solid lattice sites are sensitive to temperature. The structural stability to instability transition of theC2/cphase upon temperature is successfully captured by the radial distribution function and probability distribution of atomic displacements from first-principles MD simulations, confirmed by the phonon power spectrum analysis in the phase space. The existence of phonon quasiparticle for different normal modes is observed directly. The phonon power spectrum of specific normal modes corresponding to the Raman and infrared (IR) activations are depicted at different temperatures and pressures. The changes of frequency with temperature are in agreement with experimental results, supporting theC2/cas the hydrogen phase III. For the first time, the anharmonic phonon dispersion curves and density of states are predicted based on the phonon quasi-particle approach. Therefore, the temperature dependence of lattice vibrations can be observed directly, providing a more complete physical picture of phonon frequency distribution with respect to the Raman and IR spectra. It is found that the high-frequency regions adopt significant frequency shifts compared to the harmonic case.
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Affiliation(s)
- Yong Lu
- College of Mathematics and Physics, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Fawei Zheng
- LCP, Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China
| | - Wei Yang
- Beijing Key Laboratory of Work Safety Intelligent Monitoring, Beijing University of Posts and Telecommunications, Beijing 100876, People's Republic of China
| | - Wei Kang
- HEDPS, Center for Applied Physics and Technology, College of Engineering, Peking University, People's Republic of China
| | - Zi Li
- LCP, Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China
| | - Cong Wang
- LCP, Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China
| | - Zhuowei Gu
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
| | - Fuli Tan
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
| | - Jianheng Zhao
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
| | - Cangli Liu
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
| | - Chengwei Sun
- Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, People's Republic of China
| | - Ping Zhang
- LCP, Institute of Applied Physics and Computational Mathematics, Beijing 100088, People's Republic of China
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5
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Chen D, Cui TT, Gao W, Jiang Q. Distinguishing the Structure of High-Pressure Hydrogen with Dielectric Constants. J Phys Chem Lett 2020; 11:664-669. [PMID: 31902208 DOI: 10.1021/acs.jpclett.9b03415] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Identifying the structures of high-pressure hydrogen has been one of the central goals in high-pressure physics; however, it still presents a fundamental challenge because of the lack of an effective measure for distinguishing the structures. Herein, we address this issue by focusing on the potential candidates of phases II and III of high-pressure hydrogen. We find that the anisotropic dielectric constants of the different hydrogen solids and their responses to pressure behave differently depending on the atomic structures, corresponding to the different polarization responses of the structures to the external electric field. These findings are robust regardless of the quantum and thermal motion of hydrogen solids. Therefore, the anisotropic dielectric property can serve as a potential measure for probing the structures of high-pressure hydrogen as well as other high-pressure materials.
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Affiliation(s)
- Da Chen
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering , Jilin University , Changchun 130022 , China
| | - Ting Ting Cui
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering , Jilin University , Changchun 130022 , China
| | - Wang Gao
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering , Jilin University , Changchun 130022 , China
| | - Qing Jiang
- Key Laboratory of Automobile Materials, Ministry of Education, and School of Materials Science and Engineering , Jilin University , Changchun 130022 , China
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6
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Ultrahigh-pressure isostructural electronic transitions in hydrogen. Nature 2019; 573:558-562. [PMID: 31554980 DOI: 10.1038/s41586-019-1565-9] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Accepted: 08/02/2019] [Indexed: 11/08/2022]
Abstract
High-pressure transitions are thought to modify hydrogen molecules to a molecular metallic solid and finally to an atomic metal1, which is predicted to have exotic physical properties and the topology of a two-component (electron and proton) superconducting superfluid condensate2,3. Therefore, understanding such transitions remains an important objective in condensed matter physics4,5. However, measurements of the crystal structure of solid hydrogen, which provides crucial information about the metallization of hydrogen under compression, are lacking for most high-pressure phases, owing to the considerable technical challenges involved in X-ray and neutron diffraction measurements under extreme conditions. Here we present a single-crystal X-ray diffraction study of solid hydrogen at pressures of up to 254 gigapascals that reveals the crystallographic nature of the transitions from phase I to phases III and IV. Under compression, hydrogen molecules remain in the hexagonal close-packed (hcp) crystal lattice structure, accompanied by a monotonic increase in anisotropy. In addition, the pressure-dependent decrease of the unit cell volume exhibits a slope change when entering phase IV, suggesting a second-order isostructural phase transition. Our results indicate that the precursor to the exotic two-component atomic hydrogen may consist of electronic transitions caused by a highly distorted hcp Brillouin zone and molecular-symmetry breaking.
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7
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Goncharov AF, Freiman YA. Comment on "High-Pressure Behavior of Hydrogen and Deuterium at Low Temperatures". PHYSICAL REVIEW LETTERS 2019; 122:199601. [PMID: 31144954 DOI: 10.1103/physrevlett.122.199601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2019] [Indexed: 06/09/2023]
Abstract
X.-D. Liu et al. [Phys. Rev. Lett. 119, 065301 (2017)PRLTAO0031-900710.1103/PhysRevLett.119.065301] report on the existence of a new unique solid phase of D_{2}, which makes the high-pressure low-temperature behavior distinct from H_{2}. Here, based on the analysis of their Raman data and phase transition theory, we show that the presented data do not support this claim.
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Affiliation(s)
- Alexander F Goncharov
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington DC 20015, USA
| | - Yu A Freiman
- B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, 47 Nauki Avenue, Kharkov 61103, Ukraine
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8
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Li X, Li H, Li P, Li R, Liu J, Li Y, Cui W. A high-pressure single-crystal-diffraction experimental system at 4W2 beamline of BSRF. JOURNAL OF SYNCHROTRON RADIATION 2017; 24:699-706. [PMID: 28452764 DOI: 10.1107/s1600577517003393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Accepted: 03/01/2017] [Indexed: 06/07/2023]
Abstract
Information on the structural evolution of materials under high pressure is of great importance for understanding the properties of materials exhibited under high pressure. High-pressure powder diffraction is widely used to investigate the structure evolution of materials at such pressure. Unfortunately, powder diffraction data are usually insufficient for retrieving the atomic structures, with high-pressure single-crystal diffraction being more desirable for such a purpose. Here, a high-pressure single-crystal diffraction experimental system developed recently at beamline 4W2 of Beijing Synchrotron Radiation Facility (BSRF) is reported. The design and operation of this system are described with emphasis on special measures taken to allow for the special circumstance of high-pressure single-crystal diffraction. As an illustration, a series of diffraction datasets were collected on a single crystal of LaB6 using this system under various pressures (from ambient pressure to 39.1 GPa). The quality of the datasets was found to be sufficient for structure solution and subsequent refinement.
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Affiliation(s)
- Xiaodong Li
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
| | - Hui Li
- Institute of Microstructure and Properties of Advanced Materials, Beijing University of Technology, 100 Ping Le Yuan, Chaoyang District, Beijing 100124, People's Republic of China
| | - Pengshan Li
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
| | - Rui Li
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
| | - Jing Liu
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
| | - Yanchun Li
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
| | - Weiran Cui
- Beijing Synchrotron Radition Facility, Institute of High Energy Physics, Chinese Academy of Sciences, 19B Yuquan Road, Shijingshan District, Beijing 100049, People's Republic of China
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9
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Liu H, Zhu L, Cui W, Ma Y. Room-temperature structures of solid hydrogen at high pressures. J Chem Phys 2013; 137:074501. [PMID: 22920125 DOI: 10.1063/1.4745186] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
By employing first-principles metadynamics simulations, we explore the 300 K structures of solid hydrogen over the pressure range 150-300 GPa. At 200 GPa, we find the ambient-pressure disordered hexagonal close-packed (hcp) phase transited into an insulating partially ordered hcp phase (po-hcp), a mixture of ordered graphene-like H(2) layers and the other layers of weakly coupled, disordered H(2) molecules. Within this phase, hydrogen remains in paired states with creation of shorter intra-molecular bonds, which are responsible for the very high experimental Raman peak above 4000 cm(-1). At 275 GPa, our simulations predicted a transformation from po-hcp into the ordered molecular metallic Cmca phase (4 molecules/cell) that was previously proposed to be stable only above 400 GPa. Gibbs free energy calculations at 300 K confirmed the energetic stabilities of the po-hcp and metallic Cmca phases over all known structures at 220-242 GPa and >242 GPa, respectively. Our simulations highlighted the major role played by temperature in tuning the phase stabilities and provided theoretical support for claimed metallization of solid hydrogen below 300 GPa at 300 K.
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Affiliation(s)
- Hanyu Liu
- State Key Lab of Superhard Materials, Jilin University, Changchun 130012, China
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10
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Goncharov AF, Hemley RJ, Mao HK. Vibron frequencies of solid H2 and D2 to 200 GPa and implications for the P–T phase diagram. J Chem Phys 2011; 134:174501. [DOI: 10.1063/1.3574009] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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11
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Strobel TA, Chen XJ, Somayazulu M, Hemley RJ. Vibrational dynamics, intermolecular interactions, and compound formation in GeH4-H2 under pressure. J Chem Phys 2011; 133:164512. [PMID: 21033810 DOI: 10.1063/1.3505299] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Optical microscopy, spectroscopic and x-ray diffraction studies at high-pressure are used to investigate intermolecular interactions in binary mixtures of germane (GeH(4)) + hydrogen (H(2)). The measurements reveal the formation of a new molecular compound, with the approximate stoichiometry GeH(4)(H(2))(2), when the constituents are compressed above 7.5 GPa. Raman and infrared spectroscopic measurements show multiple H(2) vibrons substantially softened from bulk solid hydrogen. With increasing pressure, the frequencies of several Raman and infrared H(2) vibrons decrease, indicating anomalous attractive interaction for closed-shell, nonpolar molecules. Synchrotron powder x-ray diffraction measurements show that the compound has a structure based on face-centered cubic (fcc) with GeH(4) molecules occupying fcc sites and H(2) molecules likely distributed between O(h) and T(d) sites. Above ca. 17 GPa, GeH(4) molecules in the compound become unstable with respect to decomposition products (Ge + H(2)), however, the compound can be preserved metastably to ca. 27 GPa for time-scales of the order of several hours.
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Affiliation(s)
- Timothy A Strobel
- Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA.
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12
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Mao HK, Jephcoat AP, Hemley RJ, Finger LW, Zha CS, Hazen RM, Cox DE. Synchrotron X-ray Diffraction Measurements of Single-Crystal Hydrogen to 26.5 Gigapascals. Science 2010; 239:1131-4. [PMID: 17791973 DOI: 10.1126/science.239.4844.1131] [Citation(s) in RCA: 135] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The crystal structure and equation of state of solid hydrogen have been determined directly to 26.5 gigapascals at room temperature by new synchrotron x-ray diffraction techniques. Solid hydrogen remains in the hexagonal close-packed structure under these pressure-temperature conditions and exhibits increasing structural anisotropy with pressure. The pressure-volume curve determined from the x-ray data represents the most accurate experimental measurement of the equation of state to date in this pressure range. The results remove the discrepancy between earlier indirect determinations and provide a new experimental constraint on the molecular-to-atomic transition predicted at higher pressures.
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13
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Loubeyre P, LeToullec R, Hausermann D, Hanfland M, Hemley RJ, Mao HK, Finger LW. X-ray diffraction and equation of state of hydrogen at megabar pressures. Nature 1996. [DOI: 10.1038/383702a0] [Citation(s) in RCA: 350] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Zha C, Duffy TS, Mao H, Hemley RJ. Elasticity of hydrogen to 24 GPa from single-crystal Brillouin scattering and synchrotron x-ray diffraction. PHYSICAL REVIEW. B, CONDENSED MATTER 1993; 48:9246-9255. [PMID: 10007158 DOI: 10.1103/physrevb.48.9246] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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15
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Sundar CS, Bharathi A, Jean YC, Hor PH, Meng RL, Huang ZJ, Chu CW. Positron annihilation studies in the Nd-Ce-Cu-O superconductor. PHYSICAL REVIEW. B, CONDENSED MATTER 1990; 42:426-431. [PMID: 9994557 DOI: 10.1103/physrevb.42.426] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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16
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Lee SH, Conradi MS, Norberg RE. Molecular motion in solid H2 at high pressures. PHYSICAL REVIEW. B, CONDENSED MATTER 1989; 40:12492-12498. [PMID: 9991885 DOI: 10.1103/physrevb.40.12492] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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17
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Hemley RJ, Mao HK. Isotope effects in dense solid hydrogen: Phase transition in deuterium at 190+/-20 GPa. PHYSICAL REVIEW LETTERS 1989; 63:1393-1395. [PMID: 10040556 DOI: 10.1103/physrevlett.63.1393] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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18
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Hemley RJ, Mao HK. Phase transition in solid molecular hydrogen at ultrahigh pressures. PHYSICAL REVIEW LETTERS 1988; 61:857-860. [PMID: 10039448 DOI: 10.1103/physrevlett.61.857] [Citation(s) in RCA: 74] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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19
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Mao HK, Hemley RJ, Wu Y, Jephcoat AP, Finger LW, Zha CS, Bassett WA. High-pressure phase diagram and equation of state of solid helium from single-crystal x-ray diffraction to 23.3 GPa. PHYSICAL REVIEW LETTERS 1988; 60:2649-2652. [PMID: 10038413 DOI: 10.1103/physrevlett.60.2649] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Abstract
Laser techniques in conjunction with the diamond-anvil cell can be used to study high-pressure properties of materials important to a wide range of problems in earth and planetary science. Spontaneous Raman scattering of crystalline and amorphous solids at high pressure demonstrates that dramatic changes in structure and bonding occur on compression. High-pressure Brillouin scattering is sensitive to the pressure variations of single-crystal elastic moduli and acoustic velocities. Laser heating techniques with the diamond-anvil cell can be used to study phase transitions, including melting, under deep-earth conditions. Finally, laser-induced ruby fluorescence has been essential for the development of techniques for generating the maximum pressures now possible with the diamond-anvil cell, and currently provides a calibrated in situ measure of pressure well above 100 gigapascals.
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