2013 Fiscal Year Final Research Report
Changes of high-pressure properties of methane and hydrogen hydrates at low to high temperatures and inferring interiors of icy bodies
| Project/Area Number |
22244055
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Solid earth and planetary physics
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| Research Institution | Ehime University |
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Principal Investigator |
HIRAI Hisako 愛媛大学, 地球深部ダイナミクス研究センター, 特命教授 (60218758)
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| Co-Investigator(Kenkyū-buntansha) |
YAMAMOTO Yoshitaka 産業技術総合研究所, メタンハイドレートセンター, チームリーダー (80358283)
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| Co-Investigator(Renkei-kenkyūsha) |
MACHIDA Shin-ichi 一般財団法人総合科学研究機構, 利用研究促進部, ビームラインサイエンティスト (30554373)
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| Project Period (FY) |
2010-04-01 – 2014-03-31
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| Keywords | メタンハイドレート / 水素ハイドレート / 高圧 / 氷惑星・衛星 / 内部構造 |
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| Research Abstract |
Methane hydrate and hydrogen hydrate have been thought to be important constituents of icy planets and their satellites such as Neptune and Titan in the solar system, as well as in vast universe as proto-stars. The interiors of these icy bodies were inferred by probes of space crafts and by theoretical calculations, but experimental conformation has been quite limited. In the research, high pressure experiments from low temperatures to high temperatures, of which conditions were comparable to those of the interiors of icy bodies, were performed with both hydrates using diamond anvil cell, He-refrigerator cryostat, and laser-heating system. New phase changes and novel properties were observed for both hydrates. On the basis of the results, the interiors of icy planets and their satellites were inferred.
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[Journal Article] Existence of a new high-pressure phase of CO2 hydrate and lattice expansion with cage-occupancy change of sI structure under lower temperature and high pressure2011
Author(s)
Hirai, H., Komatsu, K., Honda, M., Kawamura,T., Yamamoto, Y., Yagi, T
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Journal Title
Phys, Chem. Ice 2010, (Eds: Yoshinori Furukawa, Gen Sazaki, Tsutomu Uchida, and Naoki Watanabe, Hokkaido University Press, Sapporo, Japan)
Pages: 209-214
Peer Reviewed
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[Journal Article] Intermolecular interactions between hydrogen and water molecules in filled ice structures for deuterated hydrogen hydrate under high pressure2011
Author(s)
Machida, S., Hirai, H., Kawamura, T., Yamamoto, Y. and Yagi, T
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Journal Title
Phys, Chem. Ice 2010, (Eds: Yoshinori Furukawa, Gen Sazaki, tsutomu Uchida, and Naoki Watanabe, Hokkaido University Press, Sapporo, Japan)
Pages: 111-116
Peer Reviewed
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[Presentation] Phase changes induced by guest ordering of filled ice lh structure of methane hydrate under high pressure and low temperature2013
Author(s)
Hirai, H., Tanaka, T., Matsuoka, T., Ohishi, Y., Yagi, T., Kagawa, S., Ohtake, M. and Yamamoto, Y
Organizer
APS-SCCM & AIRAPT-24 Joint Conference
Place of Presentation
Washington, USA
Year and Date
2013-07-09
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