Density measurements of liquid Fe-S alloys at high-pressure

C. Sanloup , F. Guyot (1) , P. Gillet , G. Fiquet , M. Mezouar (2) , I. Martinez (1)

1 IPGP - Institut de Physique du Globe de Paris
2 ESRF - European Synchrotron Radiation Facility

We present the first static measurements of the density of metallic liquids in the Fe-S system in the pressure and temperature range 1.5 GPa-6.2 GPa and 1500 K-1780 K. Density is inferred from X-ray absorption experiments carried out with a large volume press at the European Synchrotron Radiation Facility. It is shown that increasing the amount of sulfur in liquid iron decreases the bulk incompressibility by -2.5 GPa per 1 weight% of S. These data are important for constraining the presence and amount of sulfur in the cores of small planetary bodies.

Domaines: Planète et Univers [physics]

C. Sanloup, F. Guyot, P. Gillet, G. Fiquet, M. Mezouar, et al.. Density measurements of liquid Fe-S alloys at high-pressure. Geophysical Research Letters, 2000, 27, pp.811-814. ⟨10.1029/1999GL008431⟩. ⟨insu-03596946⟩