High pressure cosmochemistry of major planetary interiors: Laboratory studies of the water-rich region of the system ammonia-water

Details High pressure cosmochemistry of major planetary interiors: Laboratory studies of the water-rich region of the system ammonia-water High pressure cosmochemistry of major planetary interiors: Laboratory studies of the water-rich region of the system ammonia-water

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..212n&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 212-213 (SEE N85-23474 13-91)

Physics

Cosmochemistry, Gas-Solid Interactions, High Pressure, Ice, Planetary Geology, Ammonia, Extraterrestrial Matter, Geomorphology, Helium, Hydrogen, Methane, Water

Scientific paper

The behavior of gas-ice mixtures in major planets at very high pressures was studied. Some relevant pressure-temperature-composition (P-T-X) regions of the hydrogen (H2)-helium (He)-water (H2O-ammonia (NH3)-methane (CH4) phase diagram were determined. The studies, and theoretical model, of the relevant phases, are needed to interpret the compositions of ice-gas systems at conditions of planetary interest. The compositions and structures of a multiphase, multicomponent system at very high pressures care characterized, and the goal is to characterize this system over a wide range of low and high temperatures. The NH3-H2O compositions that are relevant to planetary problems yet are easy to prepare were applied. The P-T surface of water was examined and the corresponding surface for NH3 was determined. The T-X diagram of ammonia-water at atmospheric pressure was studied and two water-rich phases were found, NH3-2H2O (ammonia dihydrate), which melts incongruently, and NH3.H2O (ammonia monohydrate), which is nonstoichiometric and melts at a higher temperature than the dihydrate. It is suggested that a P-T surface at approximately the monohydrate composition and the P-X surface at room temperature is determined.

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