Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufm.p31a0956f&link_type=abstract
American Geophysical Union, Fall Meeting 2004, abstract #P31A-0956
Other
3672 Planetary Mineralogy And Petrology (5410), 3919 Equations Of State, 3954 X Ray, Neutron, And Electron Spectroscopy And Diffraction, 1060 Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), 1010 Chemical Evolution
Scientific paper
Recent studies have hypothesized that high-pressure H2O polymorphs, specifically Ice VI and Ice VII, make up a significant portion of the interiors of both Ganymede and Callisto. Several of Jupiter's satellites have been conjectured to contain subsurface salty H2O waters; therefore, any potential "warm" ice phases in the interior of these satellites could have interacted extensively with the salty oceans. Raman spectroscopy and synchrotron radiation has been used previously to study the bonding structure and unit cell parameters of pure Ice VII. However, no data exists on the effect of salts on the unit cell parameters and volume of solid H2O at high pressure. To obtain more realistic data for use in planetary physics, it is important to understand the effect of impurities on H2O at high pressure. This study measured the unit cell volumes of Ice VII formed from a 5 wt.% NaCl-H2O solution up to 25 GPa and 800 K by using a hydrothermal diamond anvil cell and synchrotron X-ray radiation. The experiments were conducted at the GSECARS 13-BM-D beamline (Advanced Photon Source), using monochromatic X-ray radiation and an online imaging system. The diffraction data indicate that the Ice VII formed from a 5 wt.% NaCl-H2O solution has a molar density that is systematically increased at any given pressure relative to the molar density of Ice VII formed from pure H2O. A zero-pressure volume, bulk modulus, and pressure derivative were calculated from this data and compared with pure Ice VII data reported by others. Thermal expansivity data of the Ice VII formed from the 5 wt.% NaCl-H2O solution will also be presented up to 21 GPa. The inclusion of NaCl into Ice VII also acts to decrease systematically the melting curve of Ice VII. The new data can be used to model the density profiles of H2O-rich bodies.
Frank Michael R.
Maglio S.
Olson Jessica
Runge Carl
Scott Henry P.
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