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Experimental evidence of superionic conduction in H2O ice
Emiko Sugimura1, Tetsuya Komabayashi, Kenji Ohta
1Department of Earth and Planetary Sciences, Tokyo Institute of Technology, Tokyo 152-8551, Japan. sugimura@geo.titech.ac.jp
The Journal of Chemical Physics
|November 28, 2012
Summary
High-pressure water ice exhibits superionic conduction at lower temperatures than predicted. Hydrogen-bond symmetrization, not superionic conduction, drives the melting curve increase in ice.
Area of Science:
- Geophysics
- Materials Science
- Physical Chemistry
Background:
- Understanding the behavior of water ice under extreme conditions is crucial for planetary science and materials research.
- Previous studies suggested superionic conduction in water ice at high pressures and temperatures, but experimental evidence was limited.
- The relationship between hydrogen-bond symmetrization and conductivity in ice remained unclear.
Purpose of the Study:
- To investigate the ionic conductivity and molar volume of H(2)O ice at high pressure and temperature.
- To determine the conduction mechanism and phase transitions in ice under extreme conditions.
- To clarify the role of hydrogen-bond symmetrization in the observed properties of ice.
Main Methods:
- Measurements of ionic conductivity and molar volume using a resistive-heated diamond anvil cell.
- High-pressure and high-temperature experiments conducted within specific ranges (P = 20-101 GPa, T = 304-930 K).
- Analysis of conductivity data using Arrhenius equations and volume data for phase transition identification.
Main Results:
- Ionic conductivity followed a single Arrhenius equation across the studied pressure and temperature ranges.
- Phase transitions in H(2)O ice were observed at 50 GPa and 53 GPa due to hydrogen-bond symmetrization.
- Experimental evidence for superionic conduction was found at significantly lower temperatures (739-749 K) than theoretically predicted.
Conclusions:
- The conduction mechanism in H(2)O ice does not change with pressure-induced hydrogen-bond symmetrization.
- The onset of superionic conduction occurs at lower temperatures than previously estimated.
- The rise in the melting curve of ice at high pressures is attributed to phase changes related to symmetrization, not the onset of superionic conduction.
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