2002 Fiscal Year Final Research Report Summary
Elastic Properties of single Crystalline Methane and carbon Bioxide Hydrates
| Project/Area Number |
13440092
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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| Research Institution | Gifu University |
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Principal Investigator |
SHIMIZU Hiroyasu Gifu Univ., Engineering, Prof., 工学部, 教授 (80023258)
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| Co-Investigator(Kenkyū-buntansha) |
KUME Tetsuji Gifu Univ., Engineering, Assistant, 工学部, 助手 (30293541)
SASAKI Shigeo Gifu Univ., Engineering, Assoc. Prof., 工学部, 助教授 (30196159)
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| Project Period (FY) |
2001 – 2002
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| Keywords | Methane hydrate / Carbon Dioxide hydrate / Diamond anvil cell / High-pressure Brillouin Scattering / High-pressure Raman Scattering / Hydrogen / Elastic properties |
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| Research Abstract |
Methane hydrate (MH) is an ice-like compound, and becomes an important material with respect to both a substantial future energy resource and a powerful greenhouse gas contributing to the global warming.
By using in situ high-pressure Brillouin spectroscopy in a diamond-anvil cell, we have determined the pressure dependence of acoustic velocities, adiabatic elastic moduli, bulk modulus, elastic anisotropy, and Cauchy violation of single-crystal methane hydrate at pressures up to 0.6 Gpa and 296 K.
Acoustic velocities show nearly isotropic behaviors with respect to the crystal orientation, and the slight TA-mode softening with pressure implies that the structure of MH is becoming less stable against the shear component under high pressures. Elastic moduli and bulk modulus indicate that MH is slightly more compressible than ice I_h.
These new results are important and available to apply gas hydrates (MH) on a future energy resource and to suppress the global warming.
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