Physics – Condensed Matter – Materials Science
Scientific paper
Mar 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996sci...271.1400s&link_type=abstract
Science, Volume 271, Issue 5254, pp. 1400-1402
Physics
Condensed Matter
Materials Science
32
Scientific paper
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 CH_4-H_2 system. The system, which has no known compounds at ambient conditions, formed four molecular compounds, CH_4(H_2)_2, (CH_4)_2H_2, CH_4(H_2)_4, and CH_4H_2, 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 CH_4(H_2)_2 crystallizes in the MgZn_2-type, hexagonal Laves phase structure, (CH_4)H_2 has a body-centered tetragonal structure that is similar to that of Al_2Cu. The 1:1 and 1:2 compounds are stable to at least 30 gigapascals.
Finger L. W.
Hemley Russell J.
Mao H.-K.
Somayazulu M. S.
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