Other
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p31b1536c&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P31B-1536
Other
[6299] Planetary Sciences: Solar System Objects / General Or Miscellaneous
Scientific paper
As it is the simplest and most abundant element in the universe, hydrogen and hydrogen-rich molecules are ubiquitous to current scientific study. Molecular hydrogen (H2) has been studied extensively under pressure as a lone entity and in conjunction with other simple molecules. However, studies on ammonia-hydrogen mixtures have been limited. The NH3+H2 system is applicable to a number of research areas including gaseous and icy planets, the chemistry of hydrogen-bonded clathrate structures, and to further the understanding of intermolecular interactions at high density. In this study we compressed binary mixtures of hydrogen and ammonia in diamond anvil cells to 13 GPa at 300K over a range of compositions, and characterized the behavior using optical microscopy, Raman spectroscopy and synchrotron X-ray diffraction. Below 1.0 GPa we observe limited mutual solubility in the fluid phases, but beyond 1 GPa (and up to 13 GPa) NH3 and H2 tend to remain phase-separated. Two phase transitions in ammonia and one in hydrogen were observed, all of which occurred at pressures comparable to those of the pure substances. A preliminary phase diagram, structural analysis and equation of state are provided.
Chidester B.
Strobel T. A.
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