Liquidus and solidus temperatures of a Fe-O-S alloy up to the pressures of the outer core: Implication for the thermal structure of the Earth's core

Details Liquidus and solidus temperatures of a Fe-O-S alloy up to the pressures of the outer core: Implication for the thermal structure of the Earth's core Liquidus and solidus temperatures of a Fe-O-S alloy up to the pressures of the outer core: Implication for the thermal structure of the Earth's core

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011e%26psl.304..559t&link_type=abstract

Earth and Planetary Science Letters, Volume 304, Issue 3-4, p. 559-564.

Physics

1

Scientific paper

The solidus and liquidus temperatures of the Fe75O5S20 alloy are determined up to 157 GPa using a laser-heated diamond anvil cell combined with in situ X-ray diffraction technique. Fe (fcc/hcp), Fe3S2/Fe3S, and FeO B1/B8/rhombohedral phases are stable under subsolidus conditions. First, Fe3S2 or Fe3S phase melts at a temperature close to the eutectic point of the Fe-Fe3S system, suggesting that the alloying effect of 5 at.% oxygen on the eutectic temperature in the Fe-Fe3S system is minor. Then FeO melts at several hundreds of degrees Kelvin higher than the solidus, and Fe is a liquidus phase in this system. The liquidus temperature is 260-670 K lower than the melting temperature of pure Fe because of the alloying effect of S and O on the melting temperature of Fe. Based on our results, the temperatures at the core/mantle boundary (TCMB) and at the boundary of the inner/outer core (TICB) are estimated to be 3600 ± 200 < TCMB < 4310 ± 350 K and TICB ~ 5630 ± 350 K, respectively. These results provide important constraints on the thermal structure of the Earth's core.

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