High-pressure Raman study of methane hydrate "filled ice"

被引：11
|
作者：
Ohtani, T. [1 ]
Ohno, Y.
Sasaki, S. [1 ]
Kume, T. [1 ]
Shimizu, H. [1 ]
机构：
[1] Gifu Univ, Dept Mat Sci & Technol, Gifu 5011193, Japan
来源：
INTERNATIONAL CONFERENCE ON HIGH PRESSURE SCIENCE AND TECHNOLOGY, JOINT AIRAPT-22 AND HPCJ-50 | 2010年 / 215卷
关键词：
PHASE-TRANSFORMATIONS; SCATTERING; GPA;
D O I：
10.1088/1742-6596/215/1/012058
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
High-pressure Raman scattering measurements for the high-pressure phase III of methane hydrate (MH-III, filled ice structure) have been performed at pressures up to 25 GPa and at 296 K. We have observed the O-H stretching Raman signal in the MH-III phase by growing the MH-III crystals over several days at 1.9 GPa. The O-H stretching vibrational peak in the MH-III phase shows negative pressure dependence indicative of hydrogen bond and disappears above 14 GPa. The symmetrization pressure of hydrogen bond in the MH-III phase is estimated to be about 45 GPa from the pressure dependence of the O-H stretching Raman frequency, which is consistent with the previous theoretical prediction.
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页数：5
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