Structure and Density of FeS at High Pressure and High Temperature and the Internal Structure of Mars

Details Structure and Density of FeS at High Pressure and High Temperature and the Internal Structure of Mars Structure and Density of FeS at High Pressure and High Temperature and the Internal Structure of Mars

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sci...268.1892f&link_type=abstract

Science, Volume 268, Issue 5219, pp. 1892-1894

Physics

86

Scientific paper

In situ x-ray diffraction measurements revealed that FeS, a possible core material for the terrestrial planets, transforms to a hexagonal NiAs superstructure with axial ratio (c/a) close to the ideal close-packing value of 1.63 at high pressure and high temperature. The high-pressure-temperature phase has shorter Fe-Fe distances than the low-pressure phase. Significant shortening of the Fe-Fe distance would lead to metallization of FeS, resulting in fundamental changes in physical properties of FeS at high pressure and temperature. Calculations using the density of the high-pressure-temperature FeS phase indicate that the martian core-mantle boundary occurs within the silicate perovskite stability field.

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