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Exploring High-Pres...
Exploring High-Pressure Transformations in Low-Z (H2, Ne) Hydrates at Low Temperatures
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- B. Brant Carvalho, Paulo H. (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
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- Mace, Amber, 1980- (author)
- Uppsala universitet,Strukturkemi,Department of Chemistry-Ångström Laboratory, Uppsala University, Uppsala, Sweden
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- Nangoi, Inna Martha (author)
- Univ Fed Juiz de Fora, Dept Chem, BR-36036900 Juiz De Fora, Brazil.,Department of Chemistry, Federal University of Juiz de Fora, Juiz de Fora, Brazil
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- Leitao, Alexandre A. (author)
- Univ Fed Juiz de Fora, Dept Chem, BR-36036900 Juiz De Fora, Brazil.,Department of Chemistry, Federal University of Juiz de Fora, Juiz de Fora, Brazil
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- Tulk, Chris A. (author)
- Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA.,Neutron Scattering Division, Oak Ridge National Laboratory, TN, Oak Ridge, United States
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- Molaison, Jamie J. (author)
- Oak Ridge Natl Lab, Neutron Scattering Div, Oak Ridge, TN 37831 USA.,Neutron Scattering Division, Oak Ridge National Laboratory, TN, Oak Ridge, United States
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- Andersson, Ove (author)
- Umeå universitet,Institutionen för fysik,Umeå Univ, Dept Phys, SE-90187 Umeå, Sweden.
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- Lyubartsev, Alexander P. (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
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- Häussermann, Ulrich (author)
- Stockholms universitet,Institutionen för material- och miljökemi (MMK),Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
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(creator_code:org_t)
- 2021-12-21
- 2022
- English.
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In: Crystals. - : MDPI AG. - 2073-4352. ; 12:1
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Abstract
Subject headings
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- The high pressure structural behavior of H-2 and Ne clathrate hydrates with approximate composition H-2/Ne center dot~4H(2)O and featuring cubic structure II (CS-II) was investigated by neutron powder diffraction using the deuterated analogues at ~95 K. CS-II hydrogen hydrate transforms gradually to isocompositional C-1 phase (filled ice II) at around 1.1 GPa but may be metastably retained up to 2.2 GPa. Above 3 GPa a gradual decomposition into C-2 phase (H-2 center dot H2O, filled ice I-c) and ice VIII' takes place. Upon heating to 200 K the CS-II to C-1 transition completes instantly whereas C-1 decomposition appears sluggish also at 200 K. C-1 was observed metastably up to 8 GPa. At 95 K C-1 and C-2 hydrogen hydrate can be retained below 1 GPa and yield ice II and ice I-c, respectively, upon complete release of pressure. In contrast, CS-II neon hydrate undergoes pressure-induced amorphization at 1.9 GPa, thus following the general trend for noble gas clathrate hydrates. Upon heating to 200 K amorphous Ne hydrate crystallizes as a mixture of previously unreported C-2 hydrate and ice VIII'.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- hydrogen hydrate
- neon hydrate
- pressure effects
- neutron diffraction
- molecular dynamics
- clathrate hydrates
Publication and Content Type
- ref (subject category)
- art (subject category)
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