High-Pressure Compounds in Methane-Hydrogen Mixtures
High-Pressure Compounds in Methane-Hydrogen Mixtures
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DOI：
10.1126/science.271.5254.1400
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发表时间：
1996-03
期刊：
影响因子：
56.9
通讯作者：
M. Somayazulu;L. Finger;R. Hemley;H. Mao
中科院分区：
文献类型：
--
作者：
M. Somayazulu;L. Finger;R. Hemley;H. Mao
压力对分子混合物中化学相互作用的影响对基础化学、行星科学和材料科学的问题都很重要。金刚石砧细胞研究揭示了CH4-H2系统中压力诱导的化学反应。该体系在环境条件下没有已知的化合物，在高达10千兆帕斯卡的压力下形成了四种分子化合物，CH4(H2)2, (CH4)2H2, CH4(H2)4和CH4H2。通过同步加速器单晶x射线衍射、多晶x射线衍射、拉曼光谱和目视观察对其进行了表征。虽然CH4(H2)2结晶为mgzn2型六方Laves相结构，但（CH4）H2具有与Al2Cu相似的体心四方相结构。1:1和1:2的化合物稳定在至少30千兆帕斯卡。
The effect of pressure on chemical interactions in molecular mixtures is important for problems spanning fundamental chemistry, planetary science, and materials science. Diamond-anvil cell studies reveal pressure-induced chemistry in the CH4-H2 system. The system, which has no known compounds at ambient conditions, formed four molecular compounds, CH4(H2)2, (CH4)2H2, CH4(H2)4, and CH4H2, at pressures up to 10 gigapascals. These have been characterized by synchrotron single-crystal x-ray diffraction, polycrystalline x-ray diffraction, Raman spectroscopy, and visual observation. Although CH4(H2)2 crystallizes in the MgZn2-type, hexagonal Laves phase structure, (CH4)H2 has a body-centered tetragonal structure that is similar to that of Al2Cu. The 1:1 and 1:2 compounds are stable to at least 30 gigapascals.