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DOI http://dx.doi.org/10.1021/jp9926490
Title Methane hydrate behavior under high pressure
Creator/Author Hirai, Hisako ; Kondo, Tadashi ; Hasegawa, Masahi [and others]
Publication Date2000 Feb 24
OSTI IdentifierOSTI ID: 20017523
Other Number(s)Journal ID: ISSN 1089-5647; JPCBFK; TRN: IM200017%%245
Resource TypeJournal Article
Resource RelationJournal Name: Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical; Journal Volume: 104; Journal Issue: 7; Other Information: PBD: 24 Feb 2000
Research OrgUniv. of Tsukuba (JP)
Subject03 NATURAL GAS; METHANE; GAS HYDRATES; CRYSTAL STRUCTURE; X-RAY DIFFRACTION; OPTICAL MICROSCOPY
Description/AbstractPhases changes in a water-methane system were investigated in a pressure range from 0.2 to 5.5 GPa using a diamond anvil cell. In-situ X-ray diffractometry and optical microscopy revealed methane hydrate behavior from growth to decomposition into high-pressure ice and solid methane at room temperature. Methane hydrate crystallized at 0.2--0.3 GPa from liquid, and it was compressed continuously until 2.3 GPa, maintaining structure 1. Below 0.7 GPa the cage occupancy was unchanged. At 1.5 GPa methane hydrate partly decomposed to ice 4 and fluid methane. The remaining methane hydrate kept structure 1, but the cage occupancy was changed; i.e., small cages became vacant. At 2.1 GPa, coexisting ice 6 transformed to ice 7 and fluid methane solidified to phase 1, while methane hydrate remained. At this pressure, structure 1 of methane hydrate was still maintained, and an additional change of cage occupancy occurred. The change in the cage occupancy is consistent with the change in compressibility observed on the compression curve, At 2.3 GPa, all of the methane hydrate decomposed into ice 7 and phase 1 of solid methane.
Country of PublicationUnited States
LanguageEnglish
FormatMedium: X; Size: page(s) 1429-1433
System Entry Date2008 Feb 08

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