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Pruteanu CG, Robinson VN, Hassanali AA, Scandolo S, Loveday J, Ackland G. How to determine solubility in binary mixtures from Neutron Scattering data: the case of methane and water. J Chem Phys 2022; 156:054502. [DOI: 10.1063/5.0077912] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ciprian Gabriel Pruteanu
- Physics and Astronomy, The University of Edinburgh School of Physics and Astronomy, United Kingdom
| | - Victor Naden Robinson
- Abdus Salam International Centre for Theoretical Physics Condensed Matter and Statistical Physics Section, Italy
| | | | | | - John Loveday
- School of Physics and Astronomy, University of Edinburgh, United Kingdom
| | - Graeme Ackland
- Department of Physics and Astronomy, The University of Edinburgh, United Kingdom
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2
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Kadobayashi H, Hirai H, Ohfuji H, Ohtake M, Muraoka M, Yoshida S, Yamamoto Y. Structural evolution of methane hydrate under pressures up to 134 GPa. J Chem Phys 2020; 152:194308. [PMID: 33687263 DOI: 10.1063/5.0007511] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
High-pressure experiments were performed to understand the structural evolution of methane hydrate (MH) up to 134 GPa using x-ray powder diffraction (XRD) and Raman spectroscopy with diamond anvil cells. XRD revealed the distinct changes in the diffraction lines of MH owing to phase transition from a guest-ordered state phase [MH-III(GOS)] to a new high-pressure phase (MH-IV) at 33.8-57.7 GPa. MH-IV was found to be stable up to at least 134 GPa without decomposition into solid methane and high-pressure ices. Raman spectroscopy showed the splits in the C-H vibration modes ν3 and ν1 of guest methane molecules in filled-ice Ih (MH-III) at 12.7 GPa and 28.6 GPa, respectively. These splits are caused by orientational ordering of guest methane molecules contained in the hydrate structure, as observed in a previous study. These results suggest that the structural evolution of the filled-ice structure of MH is caused by successive orientational ordering of guest methane molecules, thereby inducing changes in the host framework formed by water molecules.
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Affiliation(s)
- Hirokazu Kadobayashi
- National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
| | - Hisako Hirai
- Department of Environment Systems, Faculty of Geo-environmental Science, Rissho University, Kumagaya, Saitama 360-0194, Japan
| | - Hiroaki Ohfuji
- Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Michika Ohtake
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan
| | - Michihiro Muraoka
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan
| | - Suguru Yoshida
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan
| | - Yoshitaka Yamamoto
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki 305-8569, Japan
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Kadobayashi H, Hirai H, Ohfuji H, Ohtake M, Yamamoto Y. In situ Raman and X-ray diffraction studies on the high pressure and temperature stability of methane hydrate up to 55 GPa. J Chem Phys 2018; 148:164503. [PMID: 29716198 DOI: 10.1063/1.5013302] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
High-temperature and high-pressure experiments were performed under 2-55 GPa and 298-653 K using in situ Raman spectroscopy and X-ray diffraction combined with externally heated diamond anvil cells to investigate the stability of methane hydrate. Prior to in situ experiments, the typical C-H vibration modes of methane hydrate and their pressure dependence were measured at room temperature using Raman spectroscopy to make a clear discrimination between methane hydrate and solid methane which forms through the decomposition of methane hydrate at high temperature. The sequential in situ Raman spectroscopy and X-ray diffraction revealed that methane hydrate survives up to 633 K and 40.3 GPa and then decomposes into solid methane and ice VII above the conditions. The decomposition curve of methane hydrate estimated by the present experiments is >200 K lower than the melting curves of solid methane and ice VII, and moderately increases with increasing pressure. Our result suggests that although methane hydrate may be an important candidate for major constituents of cool exoplanets and other icy bodies, it is unlikely to be present in the ice mantle of Neptune and Uranus, where the temperature is expected to be far beyond the decomposition temperatures.
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Affiliation(s)
| | - Hisako Hirai
- Graduate School of Geo-environmental Science, Rissho University, Saitama 360-0194, Japan
| | - Hiroaki Ohfuji
- Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
| | - Michika Ohtake
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8569, Japan
| | - Yoshitaka Yamamoto
- National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8569, Japan
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4
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Kudryavtsev D, Serovaiskii A, Mukhina E, Kolesnikov A, Gasharova B, Kutcherov V, Dubrovinsky L. Raman and IR Spectroscopy Studies on Propane at Pressures of Up to 40 GPa. J Phys Chem A 2017; 121:6004-6011. [PMID: 28737910 DOI: 10.1021/acs.jpca.7b05492] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Raman and IR spectroscopy studies on propane were performed at pressures of up to 40 GPa at ambient temperatures using the diamond anvil cell technique. Propane undergoes three phase transitions at 6.4(5), 14.5(5), and 26.5(5) GPa in Raman spectroscopy and at 7.0(5), 14.0(5), and 27.0(5) GPa in IR spectroscopy. The phase transitions were identified using the Raman and IR splitting modes and the appearance or disappearance of peaks, which clearly corresponded to the changes in the frequencies of the modes as the pressure changed. Our results demonstrate the complex high-pressure behavior of solid propane.
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Affiliation(s)
- Daniil Kudryavtsev
- Department of Energy Technology Royal Institute of Technology , 100 44 Stockholm, Sweden
| | - Alexander Serovaiskii
- Department of Energy Technology Royal Institute of Technology , 100 44 Stockholm, Sweden
| | - Elena Mukhina
- Department of Energy Technology Royal Institute of Technology , 100 44 Stockholm, Sweden
| | - Anton Kolesnikov
- Department of Physics Gubkin Russian State University of Oil and Gas , 119991 Moscow, Russia
| | - Biliana Gasharova
- Institut für Beschleunigerphysik und Technologie (IBPT), Karlsruhe Institute of Technology , 76021 Karlsruhe, Germany
| | - Vladimir Kutcherov
- Department of Energy Technology Royal Institute of Technology , 100 44 Stockholm, Sweden
| | - Leonid Dubrovinsky
- Bayerisches Geoinstitut, University of Bayreuth , D-95440 Bayreuth, Germany
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Maynard-Casely HE, Lundegaard LF, Loa I, McMahon MI, Gregoryanz E, Nelmes RJ, Loveday JS. The crystal structure of methane B at 8 GPa--an α-Mn arrangement of molecules. J Chem Phys 2014; 141:234313. [PMID: 25527941 DOI: 10.1063/1.4903813] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
From a combination of powder and single-crystal synchrotron x-ray diffraction data we have determined the carbon substructure of phase B of methane at a pressure of ∼8 GPa. We find this substructure to be cubic with space group I4¯3m and 58 molecules in the unit cell. The unit cell has a lattice parameter a = 11.911(1) Å at 8.3(2) GPa, which is a factor of √2 larger than had previously been proposed by Umemoto et al. [J. Phys.: Condens. Matter 14, 10675 (2002)]. The substructure as now solved is not related to any close-packed arrangement, contrary to previous proposals. Surprisingly, the arrangement of the carbon atoms is isostructural with that of α-manganese at ambient conditions.
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Affiliation(s)
- H E Maynard-Casely
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - L F Lundegaard
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - I Loa
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - M I McMahon
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - E Gregoryanz
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - R J Nelmes
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
| | - J S Loveday
- SUPA, School of Physics and Astronomy and Centre for Science at Extreme Conditions, The University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom
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Tanaka T, Hirai H, Matsuoka T, Ohishi Y, Yagi T, Ohtake M, Yamamoto Y, Nakano S, Irifune T. Phase changes of filled ice Ih methane hydrate under low temperature and high pressure. J Chem Phys 2014; 139:104701. [PMID: 24050356 DOI: 10.1063/1.4820358] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Low-temperature and high-pressure experiments were performed with filled ice Ih structure of methane hydrate under 2.0-77.0 GPa and 30-300 K using diamond anvil cells and a helium-refrigeration cryostat. In situ X-ray diffractometry revealed distinct changes in the compressibility of the axial ratios of the host framework with pressure. Raman spectroscopy showed a split in the C-H vibration modes of the guest methane molecules, which was previously explained by the orientational ordering of the guest molecules. The pressure and temperature conditions at the split of the vibration modes agreed well with those of the compressibility change. The results indicate the following: (i) the orientational ordering of the guest methane molecules from an orientationally disordered state occurred at high pressures and low temperatures; and (ii) this guest ordering led to anisotropic contraction in the host framework. Such guest orientational ordering and subsequent anisotropic contraction of the host framework were similar to that reported previously for filled ice Ic hydrogen hydrate. Since phases with different guest-ordering manners were regarded as different phases, existing regions of the guest disordered-phase and the guest ordered-phase were roughly estimated by the X-ray study. In addition, above the pressure of the guest-ordered phase, another high-pressure phase developed in the low-temperature region. The deuterated-water host samples were also examined, and the influence of isotopic effects on guest ordering and phase transformation was observed.
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Affiliation(s)
- Takehiko Tanaka
- Geodynamics Research Center, Ehime University, Matsuyama, Ehime 790-8577, Japan
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7
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Carbon precipitation from heavy hydrocarbon fluid in deep planetary interiors. Nat Commun 2014; 4:2446. [PMID: 24026399 DOI: 10.1038/ncomms3446] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2013] [Accepted: 08/15/2013] [Indexed: 11/08/2022] Open
Abstract
The phase diagram of the carbon-hydrogen system is of great importance to planetary sciences, as hydrocarbons comprise a significant part of icy giant planets and are involved in reduced carbon-oxygen-hydrogen fluid in the deep Earth. Here we use resistively- and laser-heated diamond anvil cells to measure methane melting and chemical reactivity up to 80 GPa and 2,000 K. We show that methane melts congruently below 40 GPa. Hydrogen and elementary carbon appear at temperatures of >1,200 K, whereas heavier alkanes and unsaturated hydrocarbons (>24 GPa) form in melts of >1,500 K. The phase composition of carbon-hydrogen fluid evolves towards heavy hydrocarbons at pressures and temperatures representative of Earth's lower mantle. We argue that reduced mantle fluids precipitate diamond upon re-equilibration to lighter species in the upwelling mantle. Likewise, our findings suggest that geophysical models of Uranus and Neptune require reassessment because chemical reactivity of planetary ices is underestimated.
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Press W, Krasnow I, Zamponi M, Prager M. Rotational tunneling in CH4 II: disorder effects. J Chem Phys 2011; 135:224509. [PMID: 22168705 DOI: 10.1063/1.3664726] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Transitions within the tunneling multiplet of CH(4) in phase II have been measured in an experiment at the backscattering instrument BASIS of the Neutron Source SNS. They all involve transitions from or to T-states. A statistical model is put forward which accounts for local departures from tetrahedral symmetry at the sites of ordered molecules. Different from previous work, in which discrete sets of overlap matrix elements have been studied, now large numbers of elements as well as the ensemble of T-states are considered. The observed neutron spectra can be explained rather well, all based on the pocket state formalism of A. Hüller [Phys. Rev. B 16, 1844 (1977)]. A completely new result is the observation and simulation of transitions between T-states, which give rise to a double peaked feature close to the elastic position and which reflect the disorder in the system. CH(2)D(2) molecules in the CH(4) matrix are largely responsible for the disorder and an interesting topic for their own sake. The simple model presented may lend itself to a broader application.
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Affiliation(s)
- Werner Press
- Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität Kiel, Olshausenstr. 40, D-24098 Kiel, Germany.
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Lin H, Li YL, Zeng Z, Chen XJ, Lin HQ. Structural, electronic, and dynamical properties of methane under high pressure. J Chem Phys 2011; 134:064515. [DOI: 10.1063/1.3554653] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Su L, Li M, Zhu X, Wang Z, Chen Z, Li F, Zhou Q, Hong S. In Situ Crystallization of Low-Melting Ionic Liquid [BMIM][PF6] under High Pressure up to 2 GPa. J Phys Chem B 2010; 114:5061-5. [DOI: 10.1021/jp912191z] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lei Su
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Min Li
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Xiang Zhu
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Zheng Wang
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Zhenping Chen
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Fangfei Li
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Qiang Zhou
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
| | - Shiming Hong
- Department of Physics, Zhengzhou University of Light Industry, Zhengzhou 450002, China, Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China, and State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
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11
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Spanu L, Donadio D, Hohl D, Galli G. Theoretical investigation of methane under pressure. J Chem Phys 2009; 130:164520. [PMID: 19405607 DOI: 10.1063/1.3120487] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present computer simulations of liquid and solid phases of condensed methane at pressures below 25 GPa, between 150 and 300 K, where no appreciable molecular dissociation occurs. We used molecular dynamics (MD) and metadynamics techniques and empirical potentials in the rigid molecule approximation, whose validity was confirmed a posteriori by carrying out ab initio MD simulations for selected pressure and temperature conditions. Our results for the melting line are in satisfactory agreement with existing measurements. We find that the fcc crystal transforms into a hcp structure with four molecules per unit cell (B phase) at about 10 GPa and 150 K, and that the B phase transforms into a monoclinic high pressure phase above 20 GPa. Our results for solid/solid phase transitions are consistent with those of Raman studies but the phase boundaries estimated in our calculations are at higher pressure than those inferred from spectroscopic data.
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Affiliation(s)
- Leonardo Spanu
- Department of Chemistry, University of California at Davis, Davis, California 95616, USA.
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Sun L, Yi W, Wang L, Shu J, Sinogeikin S, Meng Y, Shen G, Bai L, Li Y, Liu J, Mao HK, Mao WL. X-ray diffraction studies and equation of state of methane at 202GPa. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.03.072] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Machida SI, Hirai H, Kawamura T, Yamamoto Y, Yagi T. Structural changes of filled ice Ic structure for hydrogen hydrate under high pressure. J Chem Phys 2008; 129:224505. [DOI: 10.1063/1.3013440] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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