Sound velocity measurements of ε–FeOOH up to 24 GPa

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Author(s)

    • IKEDA Osamu
    • Division of Earth and Planetary Materials Science, Faculty of Science, Tohoku University
    • SAKAMAKI Tatsuya
    • Department of Earth Science, Graduate School of Science, Tohoku University
    • OHASHI Tomonori
    • Department of Earth Science, Graduate School of Science, Tohoku University
    • GOTO Masahisa
    • Division of Earth and Planetary Materials Science, Faculty of Science, Tohoku University
    • HIGO Yuji
    • Japan Synchrotron Radiation Research Institute
    • SUZUKI Akio
    • Department of Earth Science, Graduate School of Science, Tohoku University

Abstract

<p>The sound velocity and density of ε–FeOOH have been simultaneously measured up to 24 GPa at room temperature using an ultrasonic pulse–echo–overlap method and a Kawai–type multi–anvil apparatus at BL04B1 in SPring–8. In the experimental pressure range, the velocity of both the P– and S–waves of ε–FeOOH was ~ 15% lower than that of an isostructural phase δ–AlOOH. The pressure dependence of the determined adiabatic bulk modulus (<i>K</i><sub>S</sub>) increased in the higher pressure range beyond 17 GPa, whereas that of the axial ratios <b><i>a</i></b>/<b><i>c</i></b> and <b><i>b</i></b>/<b><i>c</i></b> did not transition from negative to positive. A similar change of pressure dependence of <i>K</i><sub>S</sub> was observed in δ–AlOOH, which is followed by a transition of proton distribution state to disordered, but the axial ratios of ε–FeOOH indicate that the transition would not occur up to 24 GPa.</p>

Journal

  • Journal of Mineralogical and Petrological Sciences

    Journal of Mineralogical and Petrological Sciences 114(3), 155-160, 2019

    Japan Association of Mineralogical Sciences

Codes

  • NII Article ID (NAID)
    130007677825
  • Text Lang
    ENG
  • ISSN
    1345-6296
  • Data Source
    J-STAGE 
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