%0 Journal Article %T Physical properties of liquid Fe alloys at high pressure and their bearings on the nature of metallic planetary cores %+ École normale supérieure de Lyon (ENS de Lyon) %+ Université Pierre et Marie Curie - Paris 6 (UPMC) %+ Institut de Physique du Globe de Paris (IPGP) %A Sanloup, C. %A Guyot, F. %A Gillet, P. %A Fei, Y. %< avec comité de lecture %@ 2169-9313 %J Journal of Geophysical Research : Solid Earth %I American Geophysical Union %V 107 %8 2002 %D 2002 %Z 2002JGRB..107.2272S %R 10.1029/2001JB000808 %K Geochemistry: Composition of the core %K Mineral Physics: High-pressure behavior %K Mineral Physics: X ray %K neutron %K and electron spectroscopy and diffraction %K Planetology: Solar System Objects: Jovian satellites %K Planetology: Solar System Objects: Mars %K core %K liquid %K iron %K X-rays %K Mars %K Ganymede %Z Sciences of the Universe [physics]Journal articles %X Sulfur and silicon are among the expected alloying light elements in planetary liquid iron cores. Structural properties of Fe-27 wt % S and Fe-17 wt % Si liquid alloys at high pressure and high temperature (0-5 GPa/1400-2300 K) are measured by synchrotron X-ray diffraction. Sulfur strongly modifies the local structure of liquid iron whereas silicon has only small structural effects. Fe-27 wt % S melts are indeed poorly ordered which explains a higher compressibility compared to pure liquid Fe. These results point out the necessity to consider the strong effect of S on liquid Fe properties while modeling planetary interiors. They imply a low S content in the Earth's outer core, leaving Si as a strong candidate, and argue for a present-day Martian solid core when combined with previous global chemical models. %G English %2 https://insu.hal.science/insu-03597788/document %2 https://insu.hal.science/insu-03597788/file/Journal%20of%20Geophysical%20Research%20Solid%20Earth%20-%202002%20-%20Sanloup%20-%20Physical%20properties%20of%20liquid%20Fe%20alloys%20at%20high%20pressure.pdf %L insu-03597788 %U https://insu.hal.science/insu-03597788 %~ ENS-LYON %~ INSU %~ UNIV-PARIS7 %~ UPMC %~ AFRIQ %~ CNRS %~ IPGP %~ RIGL %~ SORBONNE-UNIVERSITE %~ UDL %~ UNIV-LYON %~ UNIV-PARIS %~ SU-TI %~ ALLIANCE-SU