000005342 001__ 5342
000005342 005__ 20210510144541.0
000005342 0247_ $$2DOI$$a10.1016/j.epsl.2021.116884
000005342 037__ $$aSCART-2021-0086
000005342 100__ $$aXu, F. 
000005342 245__ $$aThermal expansion of liquid Fe-S alloy at high pressure
000005342 260__ $$c2021
000005342 520__ $$aLocal structure and density of liquid Fe-S alloys at high pressure have been determined in situ by combined angle and energy dispersive X-ray diffraction experiments in a multi-anvil apparatus, covering a large temperature and compositional range. Precise density measurements collected for increasing temperature allowed us to directly derive the thermal expansion coefficients for liquid Fe-S alloys as a function of composition. In turn, thermal expansion has been used to refine thermodynamic models and to address the crystallization regime of telluric planetary cores by comparing the adiabatic temperature gradient and the slope of the liquidus in the Fe-FeS system. For Fe-S cores of asteroids and small planetesimals, top-down solidification is the dominant scenario as the compositional domain for which the slope of the liquidus is greater than the adiabatic gradient is limited to a narrow portion on the Fe-rich side. However, bottom-up growth of the inner core is expected for S-poor cases, with this compositional domain expanding to more S-rich compositions with increasing pressure (size of the planetary body). In particular, bottom-up crystallization cannot be excluded for the Moon and Ganymede.
000005342 594__ $$aNO
000005342 6531_ $$aliquid iron-sulfur alloys; density; thermal expansion; high pressure and temperature; telluric planetary cores; crystallization regime
000005342 700__ $$aMorard, G. 
000005342 700__ $$aGuignot, N. 
000005342 700__ $$aRivoldini, A. 
000005342 700__ $$aManthilake, G. 
000005342 700__ $$aChantel, J. 
000005342 700__ $$aXie, L. 
000005342 700__ $$aYoneda, A. 
000005342 700__ $$aKing, A. 
000005342 700__ $$aBoulard, E. 
000005342 700__ $$aPandolfi, S. 
000005342 700__ $$aRyerson, F. J. 
000005342 700__ $$aAntonangeli, D.
000005342 773__ $$pEarth and Planetary Science Letters$$v563$$y2021
000005342 8560_ $$fattilio.rivoldini@observatoire.be
000005342 8564_ $$s1541226$$uhttp://publi2-as.oma.be/record/5342/files/Xu2021aa01.pdf
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000005342 905__ $$apublished in
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