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Chinese Journal of High Pressure Physics  > 2017  >  31(6): 698-706.
FENG Lei, HUANG Hai-Jun, LENG Chun-Wei, YANG Gang. Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004
Citation: FENG Lei, HUANG Hai-Jun, LENG Chun-Wei, YANG Gang. Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure[J]. Chinese Journal of High Pressure Physics, 2017, 31(6): 698-706. doi: 10.11858/gywlxb.2017.06.004
shu

Melting Temperatures of Fe92.5O2.2S5.3 under High Pressure

doi: 10.11858/gywlxb.2017.06.004

  • School of Sciences, Wuhan University of Technology, Wuhan 430070, China

  • Received Date: 08 May 2017
  • Rev Recd Date: 17 May 2017
    Abstract
  • In the present work we determined the sound velocities of shocked Fe92.5O2.2S5.3 (in weight percent) under pressures up to 208 GPa using the reverse-impact method and the optical analyzer technique.We found that the longitudinal sound velocities of the solid Fe92.5O2.2S5.3 began to decrease at 144 GPa and completely transformed to bulk sound velocity of liquid at 165 GPa, indicating that the completely melting temperature of the sample is about (3 500±400)K based on the energy conservation relation.With respect to this point as reference, the melting temperature of Fe92.5O2.2S5.3 is about (5 000±400)K when extrapolated to the boundary of the inner/outer core using the Lindeman Law.Compared with the already measured melting temperatures of Fe, Fe-O, Fe-S and Fe-O-S, it shows that the oxygen has little effect on the melting of iron, and the melting depression of iron increases with sulfur content in the sample.If the mass fraction of the sulfur in the outer core is 2%-6%, the temperature is about 5 000-5 400 K at the inner core/outer core boundary of the Earth.

     

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