Sound velocity measurements of ε-FeOOH up to 24 GPa

Osamu Ikeda, Tatsuya Sakamaki, Tomonori Ohashi, Masahisa Goto, Yuji Higo, Akio Suzuki

Research output: Contribution to journalLetterpeer-review

7 Citations (Scopus)


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 (KS) increased in the higher pressure range beyond 17 GPa, whereas that of the axial ratios a/c and b/c did not transition from negative to positive. A similar change of pressure dependence of KS 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.

Original languageEnglish
Pages (from-to)155-160
Number of pages6
JournalJournal of Mineralogical and Petrological Sciences
Issue number3
Publication statusPublished - 2019


  • High pressure
  • Hydrogen bond symmetrization
  • Hydrous phase
  • Iron oxide hydroxide
  • Sound velocity


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