000006653 001__ 6653
000006653 005__ 20240125101810.0
000006653 037__ $$aPOSTER-2024-0012
000006653 100__ $$aZhao, B.
000006653 245__ $$aPhysical Properties of Fe-S and Fe-C-S Alloys Under Planetary Core Conditions
000006653 260__ $$c2023
000006653 269__ $$c2023-12-14
000006653 500__ $$aMR43C-0105
000006653 520__ $$aThe Fe-FeS binary is largely seen as the archetypal system to model the properties of the core of small to medium-sized telluric bodies. Noteworthy, while at the low pressures characteristic of the Moon the Fe-FeS is a simple binary eutectic, at the conditions relevant for planets such as such as Mercury, or satellite such as Ganymede, Io, and Europa, the Fe-S phase diagram is quite complex, with intermediate compounds of narrow stability field that incongruently melt. Fe-FeS compounds have thus been studied in the range 11-15 GPa, between room temperature to solidus, using in situ X-ray diffraction to assess stability and equation of state of the Fe3S2 solid phase. The stability field of FeS and Fe3S2 indicates that Fe3S2 is a potential crystallization product of S-rich telluric bodies and should be used as the end-member phase to model the properties of telluric planetary cores in the 12-20 GPa range together with, respectively, Fe or FeS depending on whether the S content is less than or grater than 27wt%. However, Fe3S2 is not expected to form in the cores of Europa, Io, or Ganymede, as they are too small, or in Mercury, as most likely too low in S. As C is another light element potentially present at a few wt% in the core of terrestrial planets, it is important to understand its effects on the properties of Fe-S alloys. Therefore, the local structure and density of ternary Fe-C-S liquid alloys have been studied in-situ by the combination of X-ray diffraction and absorption measurements between 1 and 5 GPa and 1600 to 1900 K. Obtained results allowed us to develop a thermodynamic model of the liquid Fe-C-S system that is used to correlate the densities proposed in recent models of the Moon with the S and C content within its core.
000006653 536__ $$a3PORODPLANINT/$$c3PORODPLANINT/$$f3PORODPLANINT
000006653 594__ $$aNO
000006653 700__ $$aMorard, G.
000006653 700__ $$aBoulard, E.
000006653 700__ $$aBoccato, S.
000006653 700__ $$aSiersch, N. C.
000006653 700__ $$aRivoldini, A.
000006653 700__ $$aGuignot, N.
000006653 700__ $$aHenry, L.
000006653 700__ $$aKing, A.
000006653 700__ $$aZurkowski, C.
000006653 700__ $$aFei, Y.
000006653 700__ $$aAntonangeli, D.
000006653 773__ $$tAGU 2023 San Fransisco
000006653 8560_ $$fattilio.rivoldini@ksb-orb.be
000006653 85642 $$ahttps://agu.confex.com/agu/fm23/meetingapp.cgi/Paper/1339710
000006653 8564_ $$s3634251$$uhttp://publi2-as.oma.be/record/6653/files/zhao.pdf
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000006653 980__ $$aCPOSTER