Phase changes of methane hydrate under high-temperature and pressure and inference of interiors of giant icy planets

2008 Fiscal Year Self-evaluation Report

• Project/Area Number: 18340126
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: University of Tsukuba
• Principal Investigator: HIRAI Hisako University of Tsukuba, 大学院・生命環境科学研究科, 講師 (60218758)
• Project Period (FY): 2006 – 2009
• Keywords: 内部構造

Research Abstract

メタンハイドレートの高温高圧実験を行い、相変化や構造変化を明らかにし、それらの結果を基に、海王星や天王星などの巨大氷惑星の内部構造を推定するものである。

Research Products

• [Journal Article] Phase changes of solid methane under high pressure up to 86 Gpa at room temperature (2008)
  • Author(s): Hisako Hirai, Keisuke Konagai, Taro Kawamura, Yoshitaka Yamamoto, Takehiko Yagi
  • Journal Title: Chem.Phys.Lett.454 Pages: 212-217
  • Peer Reviewed
• [Journal Article] Takehiko Yagi Structural changes and preferential cage occupancy of rthane hydrate and methane-ethane mixed gas hydrate under veryhighpressure (2008)
  • Author(s): Hisako Hirai, Naoya Takahara, Taro Kawamura, Yoshitaka Yamamoto
  • Journal Title: J.Chem.Phys.129 Pages: 224503
  • Peer Reviewed
• [Journal Article] Changes in vibration modes of hydrogen and water molecules and in lattice parameters with pressure for filles-icehydrogenhydrates (2007)
  • Author(s): Hirai, H., Ohno, S., Kawamura, T., Yamamoto, Y., Yagi, T.
  • Journal Title: Phys. Chem. C 111 Pages: 312-315
  • Peer Reviewed
• [Journal Article] Stabilizing of methane hydrate and transition to a new high-pressure structure at 40 Gpa (2006)
  • Author(s): H. Hirai, S. Machida, T. Kawamura, Y. Yamamoto, T. Yagi
  • Journal Title: Mineralogist 91 Pages: 826-830
  • Peer Reviewed
• [Presentation] Solid Methane Behaviours under High Temperature and High Pressure (2007)
  • Author(s): H. Hirai, S. Machida, T. Kawamura, Y. Yamamoto, and T. Yagi
  • Organizer: The Joint 21^<st> AIRAPT and 45^<th> EHPRG
  • Place of Presentation: Catania,Italy
  • Year and Date: 20070917-21
• [Book] 『地球進化学』(指田勝男、久田健一郎、角替敏明、八木勇治、小室光世、興野純, 地球の内部構造、地球内部のダイナミクスと地球進化) (2007)
  • Author(s): 平井寿子
  • Total Pages: 7-13
  • Publisher: 古今書院