Phase stability and density of FeS at high pressures and temperatures: implications for the interior structure of Mars

Details Phase stability and density of FeS at high pressures and temperatures: implications for the interior structure of Mars Phase stability and density of FeS at high pressures and temperatures: implications for the interior structure of Mars

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001e%26psl.185...25k&link_type=abstract

Earth and Planetary Science Letters, Volume 185, Issue 1-2, p. 25-33.

Physics

21

Scientific paper

The phase diagram of stoichiometric iron sulfide (FeS) was investigated at high pressures and temperatures (15-35 GPa, 1400-2200 K) with a laser-heated diamond anvil cell and synchrotron X-ray diffraction. The NiAs-structured polymorph of FeS is found to be stable within the P-T range of the Martian core. The density of FeS at 1600 K is measured to be 5.96 g/cm3 at 17 GPa and 6.65 g/cm3 at 35 GPa. The density measurements are used to evaluate structural models of Mars containing a core within the Fe-FeS system. The models that satisfy the geophysical constraints proscribe limits on the thickness of the Martian crust, the size and composition of the core, and the thickness of a perovskite-bearing layer close to the Martian core-mantle boundary.

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