The phase diagram of high-pressure superionic ice

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. At high pressure, water forms superionic ice with an oxygen lattice and melted liquid hydrogens, which could exist on ice-rich planets. Here, Sun et al. predict a new phase of superionic ice where the hydrogens preferentially diffuse in two-dimensions within oxygen superlattice with the P21/c symmetry.

• Publication year

  2015

• Venue

  Nature Communications

• Publication date

  2015-08-28

• Fields of study

  Materials Science, Medicine, Physics

• Identifiers
  DOI 10.1038/ncomms9156PMID 26315260PMCID 4560814
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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