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Sound velocity of hexagonal close-packed iron to the Earth’s inner core pressure

Author

Listed:
  • Daijo Ikuta

    (Tohoku University)

  • Eiji Ohtani

    (Tohoku University)

  • Hiroshi Fukui

    (RIKEN SPring-8 Center
    Japan Synchrotron Radiation Research Institute)

  • Takeshi Sakai

    (Ehime University)

  • Daisuke Ishikawa

    (RIKEN SPring-8 Center
    Japan Synchrotron Radiation Research Institute)

  • Alfred Q. R. Baron

    (RIKEN SPring-8 Center
    Japan Synchrotron Radiation Research Institute)

Abstract

Here we determine the compressional and shear wave velocities (vp and vs) of hexagonal close-packed iron, a candidate for the main constituent of the Earth’s inner core, to pressures above 300 gigapascals using a newly designed diamond anvil cell and inelastic X-ray scattering combined with X-ray diffraction. The present results reveal that the vp and vs of the Preliminary reference Earth model (PREM) inner core are 4(±2)% and 36(±17)% slower than those of the pure iron, respectively at the centre of the core. The density and sound velocity of the PREM inner core can be explained by addition of 3(±1) wt% silicon and 3(±2) wt% sulphur to iron‒5 wt% nickel alloy. Our suggested inner core composition is consistent with the existing outer core model with oxygen, as the growth of the inner core may have created a secular enrichment of the element in the outer core.

Suggested Citation

  • Daijo Ikuta & Eiji Ohtani & Hiroshi Fukui & Takeshi Sakai & Daisuke Ishikawa & Alfred Q. R. Baron, 2022. "Sound velocity of hexagonal close-packed iron to the Earth’s inner core pressure," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-34789-2
    DOI: 10.1038/s41467-022-34789-2
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    References listed on IDEAS

    as
    1. Yu He & Shichuan Sun & Duck Young Kim & Bo Gyu Jang & Heping Li & Ho-kwang Mao, 2022. "Superionic iron alloys and their seismic velocities in Earth’s inner core," Nature, Nature, vol. 602(7896), pages 258-262, February.
    2. Agnès Dewaele & Paul Loubeyre & Florent Occelli & Olivier Marie & Mohamed Mezouar, 2018. "Toroidal diamond anvil cell for detailed measurements under extreme static pressures," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
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