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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Diamond-Anvil Cell Observations of a New Methane Hydrate Phase in the 100-MPa Pressure Range
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Diamond-Anvil Cell Observations of a New Methane Hydrate Phase in the 100-MPa Pressure Range

机译：在100 MPa压力范围内的新型甲烷水合物相的金刚石-砧室观察

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摘要

A new high-pressure phase of methane hydrate has been identified based onits high optical relief, distinct pressure-temperature phase relations, and Raman spectra. In-situ optical observations were made in a hydrothermal diamond-anvil cell at temperatures between -40 deg and 60 deg C and at pressures up to 900 MPa. Two new invariant points were located at -8.7 deg C and 99 MPa for the assemblage consisting of the new phase, structure I methane hydrate, ice Ih, and water, and at 35.3 deg C and 137 MPa for the new phase-structure I methane hydrate-water-methane vapor. Existence of the new phase is critical for understanding the phase relations among the hydrates at low to moderate pressures, and may also have important implications for understanding the hydrogen bonding in H_2O and the behavior of water in the planetary bodies, such as Europa, of the outer solar system.
机译：基于甲烷水合物的高光学浮雕，明显的压力-温度相关系和拉曼光谱，已经确定了一种新的甲烷水合物高压相。在水热金刚石-铁砧室中，在-40摄氏度至60摄氏度之间的温度下，在最高900 MPa的压力下进行了原位光学观察。对于由新相，结构I甲烷水合物，冰Ih和水组成的集合，两个新的不变点位于-8.7℃和99 MPa，对于新相结构I甲烷位于35.3℃和137 MPa。水合物-水-甲烷蒸气。新相的存在对于理解低至中等压力下水合物之间的相关系至关重要，也可能对理解H_2O中的氢键和行星状水（例如欧罗巴）中水的行为具有重要意义。外部太阳系。

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