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Stability of Ar(H2)2 to 358 GPa
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- Ji, Cheng (författare)
- Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China.;Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA.
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- Goncharov, Alexander F. (författare)
- Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA.;Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China.
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- Shukla, Vivekanand (författare)
- Uppsala universitet,Materialteori
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- Ctr High Pressure Sci & Technol Adv Res, Shanghai 201203, Peoples R China;Carnegie Inst Sci, Geophys Lab, High Pressure Collaborat Access Team, Argonne, IL 60439 USA. Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA.;Chinese Acad Sci, Inst Solid State Phys, Key Lab Mat Phys, Hefei 230031, Peoples R China. (creator_code:org_t)
- 2017-03-13
- 2017
- Engelska.
- Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 114:14, s. 3596-3600
- Tidskriftsartikel (refereegranskat)
Abstract
Ämnesord
Stäng
- "Chemical precompression" through introducing impurity atoms into hydrogen has been proposed as a method to facilitate metallization of hydrogen under external pressure. Here we selected Ar(H-2)(2), a hydrogen-rich compound with molecular hydrogen, to explore the effect of "doping" on the intermolecular interaction of H-2 molecules and metallization at ultrahigh pressure. Ar(H-2)(2) was studied experimentally by synchrotron X-ray diffraction to 265 GPa, by Raman and optical absorption spectroscopy to 358 GPa, and theoretically using the density-functional theory. Our measurements of the optical bandgap and the vibron frequency show that Ar(H-2)(2) retains 2-eV bandgap and H-2 molecular units up to 358 GPa. This is attributed to reduced intermolecular interactions between H-2 molecules in Ar(H-2)(2) compared with that in solid H-2. A splitting of the molecular vibron mode above 216 GPa suggests an orientational ordering transition, which is not accompanied by a change in lattice symmetry. The experimental and theoretical equations of state of Ar(H-2)(2) provide direct insight into the structure and bonding of this hydrogen-rich system, suggesting a negative chemical pressure on H-2 molecules brought about by doping of Ar.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- ultrahigh pressure
- hydrogen-rich compound
- intermolecular interaction
- metallization
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- art (ämneskategori)
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