Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.p42a..02y&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #P42A-02
Other
3919 Equations Of State, 3924 High-Pressure Behavior, 5460 Physical Properties Of Materials, 8147 Planetary Interiors (5430, 5724)
Scientific paper
It is widely accepted that 8-18wt% light elements in the Earth's outer core can explain the 10% density deficit compared to the pure Fe at the core pressure and temperature. Si is one of the most probable light elements in the outer core and is also a candidate for other planetary bodies (Mars, Ganymede, Io). In this study, equation of state (EOS) of liquid Fe-17wt%Si is being explored to investigate the possible existence of Si in the cores of planetary bodies. Sink-float static high pressure density measurement technique with composite spheres is used to bracket the liquid density by either sinking, floating or neutrally buoyant markers. The composite spheres consist of a Pt or WC core and a ruby mantle, with adjustable density by changing the radius ratio of the core and mantle material, thus increasing the range of density measurement and accuracy of bracket value. The chemically inert mantle efficiently protects the metal core from reacting with the sample. The high density of Pt/WC core ensures a composite sphere with high enough density and relative small volume to be accommodated within the pressure cell. Density of the probe spheres at high P, T was calculated from the post-experiment geometric analyses according to the areal ratio of the mantle and core materials. Compressibility and thermal expansion coefficients of these materials were used in the third-order Birch-Murnaghan EOS to calculate composite sphere density. The density of liquid Fe-17wt%Si at room pressure was estimated to be approximately 5.86 g/cm3, which is taken as a reference for constructing a reliable EOS. The results of experiments so far to 8GPa and at 1773K will be reported.
Secco Richard A.
Yu Xiaotong
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