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Nov 2021
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Chinese Journal of High Pressure Physics  > 2021  >  35(6): 060101.
GAN Bo, LI Jun, JIANG Gang, ZHANG Youjun. A Review of the Experimental Determination of the Melting Curve of Iron at Ultrahigh Pressures[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 060101. doi: 10.11858/gywlxb.20210859
Citation: GAN Bo, LI Jun, JIANG Gang, ZHANG Youjun. A Review of the Experimental Determination of the Melting Curve of Iron at Ultrahigh Pressures[J]. Chinese Journal of High Pressure Physics, 2021, 35(6): 060101. doi: 10.11858/gywlxb.20210859
shu

A Review of the Experimental Determination of the Melting Curve of Iron at Ultrahigh Pressures

doi: 10.11858/gywlxb.20210859
  • 1.

    Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, Sichuan, China

  • 2.

    Institute of Fluid Physics, CAEP, Mianyang 621999, Sichuan, China

  • Received Date: 02 Aug 2021
  • Rev Recd Date: 12 Sep 2021
    Abstract
  • Iron is one of the typical d-orbital transition metals. Its melting behavior and melting curve at high pressure are of great importance for revealing the composition, thermal structure, and thermal evolution of the Earth’s core. Creating the extreme high pressure-temperature conditions and measuring the melting temperatures of the condensed matters in the laboratory are quite challenging, resulting in a long-term controversy on the melting curves of iron at high pressures among various experiments and between experiments and theories. With the development of various experimental techniques, the results between experimental and theoretical studies are generally consistent with each other. This review presents the main static and dynamic compression techniques that have been used to study the high-pressure melting curve of iron in recent years; it also explores the advantages and disadvantages of melting diagnostics for iron and transition metals. The possible reasons for the discrepancy in the melting curves of iron are also discussed. Based on the experimental and theoretical results of the melting curve of iron, the melting temperature of iron can be anchored to 5900–6300 K at the pressure of the inner core boundary (ICB, about 330 GPa). Summarizing the current researches on the melting behaviors of iron under static and dynamic compression has an important implication for studying the melting curves of other transition metals, as well as the melting mechanism.

     

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