The phase diagram of high-pressure superionic ice
- Princeton Univ., NJ (United States). Dept. of Physics; Department of Physics, Princeton University, Princeton, New Jersey 08544
- Univ. of Illinois, Urbana, IL (United States). Dept. of Physics
- Princeton Univ., NJ (United States). Dept. of Physics. Dept. of Chemistry. Princeton Inst. for the Science and Technology of Materials
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.
- Research Organization:
- Princeton Univ., NJ (United States); Univ. of Illinois, Urbana, IL (United States)
- Sponsoring Organization:
- National Science Foundation (NSF) (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- SC0005180; SC0008626; SC0008692
- OSTI ID:
- 1455142
- Journal Information:
- Nature Communications, Journal Name: Nature Communications Vol. 6; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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