The ammonia-water phase diagram and its implications for icy satellites

Details The ammonia-water phase diagram and its implications for icy satellites The ammonia-water phase diagram and its implications for icy satellites

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.6339j&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, June 10, 1987, p. 6339-6349. Research supported by the University of

Mathematics

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23

Ammonia, Ice Environments, Icy Satellites, Phase Diagrams, Planetary Composition, Titan, Water, Ammonium Compounds, Magma, Oceans, Stratification, Planets, Satellites, Ammonia, Water, Icy Bodies, Laboratory Studies, Phases, Water Ice, Liquid Phase, Ammonia Monohydrate, Ammonia Dihydrate, Pressure Effects, Experiments, Procedure, Phase Diagrams, Composition, Data, Melting, Temperature, Condensation, Saturn, Titan

Scientific paper

The authors have used a Holzapfel-type diamond anvil cell to determine the NH3-H2O phase diagram in the region from 0 to 33 mol % NH3, 240 to 370K, and 0 to 5 GPa. The following phases were identified: liquid; water ices Ih, III, V, VI, VII, and VIII; ammonia monohydrate, NH3H2O; and ammonia dihydrate, NH32H2O. Ammonia dihydrate becomes prominent at moderate pressures (less than 1 GPa), with planetologically significant implications, including the possibility of layering in Titan's magma ocean.

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