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Compressional wave velocity for iron hydrides to 100 gigapascals via picosecond acoustics

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Abstract

We performed synchrotron X-ray diffraction (XRD) and picosecond acoustic measurements on iron hydrides (FeHX) synthesized in laser-heated diamond anvil cells at pressures up to 100 GPa and 300 K. The obtained XRD data reveals that hcp FeH1.1, hcp FeH0.3, and fcc FeH1.0 were synthesized, and we determined the compressional wave velocities (VP) of the latter two phases. We discovered that the VP–density (ρ) relationships for fcc FeH1.0 changed between 8.7 and 9.2 g/cm3 (at about 60 GPa), which may be due to a magnetic transition. A comparison of the preliminary reference Earth model (PREM) with a Birch’s law extrapolation considering the temperature effect of our experimental VP–ρ results support the hypothesis of hydrogen presence in the Earth’s inner core.

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Acknowledgements

S. I. Kawaguchi helped experiments at SPring-8. The synchrotron XRD experiments were performed at the BL10XU of SPring-8 (Proposal No. 2019A0072, 2019B0072, 2020A0072, 2020B0072, and 2021A0072). This work was supported by JSPS KAKENHI (Grant No. 18J21664 and 19H00716). We would like to thank two anonymous reviewers for very helpful reviews.

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Authors and Affiliations

  1. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo, 152-8551, Japan

    Tatsuya Wakamatsu & Kenji Ohta

  2. Department of Earth and Planetary Science, The University of Tokyo, Tokyo, 113-0033, Japan

    Shoh Tagawa & Kei Hirose

  3. Earth-Life Science Institute, Tokyo Institute of Technology, Tokyo, 152-8550, Japan

    Shoh Tagawa & Kei Hirose

  4. National Metrology Institute of Japan, National Institute of Advanced Industrial Science and Technology, Ibaraki, 305-8563, Japan

    Takashi Yagi

  5. SPring-8, Japan Synchrotron Radiation Research Institute, Hyogo, 679-5198, Japan

    Yasuo Ohishi

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  1. Tatsuya Wakamatsu
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  2. Kenji Ohta
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  3. Shoh Tagawa
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  4. Takashi Yagi
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  6. Yasuo Ohishi
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Correspondence to Kenji Ohta.

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Wakamatsu, T., Ohta, K., Tagawa, S. et al. Compressional wave velocity for iron hydrides to 100 gigapascals via picosecond acoustics. Phys Chem Minerals 49, 17 (2022). https://doi.org/10.1007/s00269-022-01192-8

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