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Partial phase diagram for the system NH3-H2O - The water-rich regionPhase boundaries of the H2O-NH3 system for (NH3)/x/(H2O)/1-x/ have been determined with diamond-anvil cells for mixtures in two composition ranges: (1) for x in the range from 0 to 0.3, at pressures up to 4 GPa at 21 C, and (2) for x in the range from 0.46 to 0.50, at pressures up to 5 GPa from 150 to 400 K. Phases were identified visually with a microscope and polarized optics. The NH3.2(H2O) phase is strongly anisotropic with a much smaller refractive index than that of ice VII and cracks in two nonperpendicular networks. NH3.H2O has a refractive index closer to that of Ice VII and does not appear to form cracks. Both phases are colorless. Phase boundaries were determined on both increasing and decreasing pressures, and compositions of the ammonia ices were determined by estimating relative amounts of water and ammonia ices at known overall compositions. For low-ammonia compositions (x equal to or less than 0.15), the following assemblages succedd one another as pressure increases: liquid; liquid and Ice VI (at 1.0 + GPa); liquid and Ice VII (at 2.1 GPa); Ice VII and NH3.H2O (at 3.5 GPa). For x in the range from 0.15 to 0.30, the water ice and liquid fields are replaced by the NH3.2(H2O) and liquid field at pressures down to 1.0 GPa and lower.
Document ID
19840058256
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Johnson, M. L.
(California Univ. Los Angeles, CA, United States)
Schwake, A.
(California Univ. Los Angeles, CA, United States)
Nicol, M.
(California, University Los Angeles, CA, United States)
Date Acquired
August 12, 2013
Publication Date
January 1, 1984
Subject Category
Inorganic And Physical Chemistry
Accession Number
84A41043
Funding Number(s)
CONTRACT_GRANT: NAGW-104
Distribution Limits
Public
Copyright
Other

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