Experimental evidence of superionic conduction in H2O ice

Emiko Sugimura*, Tetsuya Komabayashi, Kenji Ohta, Kei Hirose, Yasuo Ohishi, Leonid S. Dubrovinsky

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Ionic conductivity and molar volume measurements were performed on H2O ice at high pressure (P) and temperature (T) in a resistive-heated diamond anvil cell. The conductivity data obtained at P 20-62 GPa, T 304-930 K are well fitted with a single Arrhenius equation. Isothermal volume measurements at T 873 K, P 30-101 GPa indicate that H2O ice undergoes phase transitions at P 50 GPa and 53 GPa due to hydrogen-bond symmetrization. Combining these results, we suggest that the conduction mechanism does not change with pressure-induced hydrogen-bond symmetrization. Along the Arrhenius behavior of conductivity data, the experimental evidence for superionic conduction (>10 Scm) was found at T 739 K, P 56 GPa and T 749 K, P 62 GPa, which is significantly low temperature compared with earlier theoretical estimates resorted to the observation of a drastic rise of the melting curve. We infer that the sudden increase of the melting temperature is not related to the onset of superionic conduction, but is attributed to the phase change regarding to the symmetrization.
Original languageEnglish
Article number194505
Pages (from-to)1-8
Number of pages8
JournalJournal of Chemical Physics
Volume137
Issue number19
DOIs
Publication statusPublished - 21 Nov 2012

Keywords

  • High pressure
  • Diamond anvil cells
  • Ice
  • Superionic
  • X-Ray Diffraction
  • Ionic conductivity

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