000005617 001__ 5617
000005617 005__ 20220125202444.0
000005617 0247_ $$2DOI$$a10.1038/s41467-022-27991-9
000005617 037__ $$aSCART-2022-0023
000005617 100__ $$aEdmund, E. 
000005617 245__ $$aThe Fe-FeSi phase diagram at Mercury’s core conditions
000005617 260__ $$c2022
000005617 520__ $$aMercury’s metallic core is expected to have formed under highly reducing conditions, resulting in the presence of significant quantities of silicon alloyed to iron. Here we present the phase diagram of the Fe-FeSi system, reconstructed from in situ X-ray diffraction measurements at pressure and temperature conditions spanning over those expected for Mercury’s core, and ex situ chemical analysis of recovered samples. Under high pressure, we do not observe a miscibility gap between the cubic fcc and B2 structures, but rather the formation of a re-entrant bcc phase at temperatures close to melting. Upon melting, the investigated alloys are observed to evolve towards two distinct Fe-rich and Fe-poor liquid compositions at pressures below 35-38 GPa. The evolution of the phase diagram with pressure and temperature prescribes a range of possible core crystallization regimes, with strong dependence on the Si abundance of the core.
000005617 536__ $$a3PRODPLANINT/$$c3PRODPLANINT/$$f3PRODPLANINT
000005617 594__ $$aNO
000005617 700__ $$aMorard, G. 
000005617 700__ $$aBaron, M. A. 
000005617 700__ $$aRivoldini, A. 
000005617 700__ $$aYokoo, S. 
000005617 700__ $$aBoccato, S. 
000005617 700__ $$aHirose, K. 
000005617 700__ $$aPakhomova, A. 
000005617 700__ $$aAntonangeli, D.
000005617 773__ $$n1$$pNature Communications$$v13$$y2022
000005617 8560_ $$fattilio.rivoldini@observatoire.be
000005617 8564_ $$s1341945$$uhttp://publi2-as.oma.be/record/5617/files/Edmund2022ut81.pdf
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000005617 905__ $$apublished in
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