scholarly journals Pressure-induced amorphization of noble gas clathrate hydrates

2021 ◽  
Vol 103 (6) ◽  
Author(s):  
Paulo H. B. Brant Carvalho ◽  
Amber Mace ◽  
Ove Andersson ◽  
Chris A. Tulk ◽  
Jamie Molaison ◽  
...  
Keyword(s):  
Noble Gas ◽  
Clathrate Hydrates

scholarly journals Exploring High-Pressure Transformations in Low-Z (H2, Ne) Hydrates at Low Temperatures

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 9
Author(s):  
Paulo H. B. Brant Carvalho ◽  
Amber Mace ◽  
Inna Martha Nangoi ◽  
Alexandre A. Leitão ◽  
Chris A. Tulk ◽  
...  
Keyword(s):  
High Pressure ◽  
Powder Diffraction ◽  
Low Temperatures ◽  
General Trend ◽  
Noble Gas ◽  
Neutron Powder Diffraction ◽  
Clathrate Hydrates ◽  
Structural Behavior ◽  
Approximate Composition ◽  
Cubic Structure

The high pressure structural behavior of H2 and Ne clathrate hydrates with approximate composition H2/Ne·~4H2O 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 C1 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 C2 phase (H2·H2O, filled ice Ic) and ice VIII’ takes place. Upon heating to 200 K the CS-II to C1 transition completes instantly whereas C1 decomposition appears sluggish also at 200 K. C1 was observed metastably up to 8 GPa. At 95 K C1 and C2 hydrogen hydrate can be retained below 1 GPa and yield ice II and ice Ic, 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 C2 hydrate and ice VIII’.

Noble gas encapsulation: clathrate hydrates and their HF doped analogues

2014 ◽  
Vol 16 (33) ◽  
pp. 17943-17954 ◽  
Author(s):  
Sukanta Mondal ◽  
Pratim Kumar Chattaraj
Keyword(s):  
Noble Gas ◽  
Clathrate Hydrates ◽  
Gas Encapsulation

The noble gas encapsulating ability of HF doped 512 and 51268 clathrate hydrates increases with the increase in the size of the noble gas atom and decrease in the hydrate cage radius.

Interactions of noble gas atoms. Processes due to elastic scattering

1989 ◽  
Vol 14 (5) ◽  
pp. 467-604 ◽  
Author(s):  
A.Z. Devdariani ◽  
A.L. Zagrebin ◽  
K.B. Blagoev
Keyword(s):  
Elastic Scattering ◽  
Noble Gas

scholarly journals A Petrologic and Noble Gas Isotopic Study of New Basaltic Eucrite Grove Mountains 13001 from Antarctica

Minerals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 279
Author(s):  
Chuantong Zhang ◽  
Bingkui Miao ◽  
Huaiyu He ◽  
Hongyi Chen ◽  
P. M. Ranjith ◽  
...  
Keyword(s):  
Noble Gas ◽  
Research Work ◽  
Cosmic Ray ◽  
Parent Body ◽  
Chemical Compositions ◽  
Isotopic Study ◽  
Impact Processes ◽  
Antarctic Research ◽  
Formation And Evolution ◽  
Grove Mountains

Howardite-Eucrite-Diogenite (HED) meteorite clan is a potential group of planetary materials which provides significant clues to understand the formation and evolution of the solar system. Grove Mountains (GRV) 13001 is a new member of HED meteorite, recovered from the Grove Mountains of Antarctica by the Chinese National Antarctic Research Expedition. This research work presents a comprehensive study of the petrology and mineralogy, chemical composition, noble gas isotopes, cosmic-ray exposure (CRE) age and nominal gas retention age for the meteorite GRV 13001. The output data indicate that GRV 13001 is a monomict basaltic eucrite with typical ophitic/subophitic texture, and it consists mainly of low-Ca pyroxene and plagioclase with normal eucritic chemical compositions. The noble gas based CRE age of the GRV 13001 is approximately 29.9 ± 3.0 Ma, which deviates from the major impact events or periods on the HED parent body. Additionally, the U,Th-4He and 40K-40Ar gas retention ages of this meteorite are ~2.5 to 4.0 Ga and ~3.6 to 4.1 Ga, respectively. Based on the noble gases isotopes and the corresponding ages, GRV 13001 may have experienced intense impact processes during brecciation, and weak thermal event after the ejection event at approximately 30 Ma.

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