1996 Fiscal Year Final Research Report Summary
High-pressure elastic properties of VI, VII and VIII phases in dense H_2O ice by Brillouin Scattering
Project/Area Number |
07454062
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Research Field |
固体物性Ⅰ(光物性・半導体・誘電体)
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Research Institution | Gifu University |
Principal Investigator |
SHIMIZU Hiroyasu Gifu University, Dept. of Electronics, Professor, 工学部, 教授 (80023258)
|
Co-Investigator(Kenkyū-buntansha) |
SASAKI Shigeo Gifu University, Dept. of Electronics, Assoc. Prof., 工学部, 助教授 (30196159)
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Project Period (FY) |
1995 – 1996
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Keywords | Ice / High-Pressure Phase / Brillouin Scattering / Sound Velocity / Elastic Constant |
Research Abstract |
We have determined acoustic velocities in any direction, refractive index, adiabatic elastic constants, and adiabatic bulk modulus of H_2O and D_2O ices at 300K and at pressures between 1.05 and 2.1 GPa for tetragonal ice VI and above pressures up to 8 GPa for cubic ice VII.Typical values of elastic constants for H_2O ice VI are C_<11>=32.8, C_<12>=11.8, C_<13>=14.7, C_<33>=27.8, C_<44>=6.3, and C_<66>=5.9 GPa at the pressure of 1.23 GPa Moreover, for H_2O ice VII the values of 3 elastic constants are C_<11>=57, C_<12>=31, and C_<44>=32, GPa at P=4.7 GPa. Refractive index and elastic constants show no distinction between H_2O and D_2O over the observed pressure ranges. At ice VI*VII transition at 2.1 GPa, acoustic velocities, refractive index, and elastic constants present drastic change, but the adiabatic bulk modulus shows almost continuous change which is most likely to relate the common features of the selfclathrate structure and the potential function in both VI and VII ices. These results studied by Brillouin Spectroscopy are noticeable in the high-pressure world.
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Research Products
(10 results)