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The phase diagram of high-pressure superionic ice

Author

Listed:
  • Jiming Sun

    (Princeton University)

  • Bryan K. Clark

    (University of Illinois at Urbana-Champaign)

  • Salvatore Torquato

    (Princeton University
    Princeton University
    Princeton Institute for the Science and Technology of Materials)

  • Roberto Car

    (Princeton University
    Princeton University
    Princeton Institute for the Science and Technology of Materials)

Abstract

Superionic ice is a special group of ice phases at high temperature and pressure, which may exist in ice-rich planets and exoplanets. In superionic ice liquid hydrogen coexists with a crystalline oxygen sublattice. At high pressures, the properties of superionic ice are largely unknown. Here we report evidence that from 280 GPa to 1.3 TPa, there are several competing phases within the close-packed oxygen sublattice. At even higher pressure, the close-packed structure of the oxygen sublattice becomes unstable to a new unusual superionic phase in which the oxygen sublattice takes the P21/c symmetry. We also discover that higher pressure phases have lower transition temperatures. The diffusive hydrogen in the P21/c superionic phase shows strong anisotropic behaviour and forms a quasi-two-dimensional liquid. The ionic conductivity changes abruptly in the solid to close-packed superionic phase transition, but continuously in the solid to P21/c superionic phase transition.

Suggested Citation

  • Jiming Sun & Bryan K. Clark & Salvatore Torquato & Roberto Car, 2015. "The phase diagram of high-pressure superionic ice," Nature Communications, Nature, vol. 6(1), pages 1-8, November.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9156
    DOI: 10.1038/ncomms9156
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    Cited by:

    1. Kyla de Villa & Felipe González-Cataldo & Burkhard Militzer, 2023. "Double superionicity in icy compounds at planetary interior conditions," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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