Superionic to superionic phase change in water: consequences for the interiors of uranus and neptune.

Using density functional molecular dynamics free energy calculations, we show that the body centered cubic (bcc) phase of superionic ice previously believed to be the only phase is, in fact, thermodynamically unstable compared to a novel phase with oxygen positions in face centered cubic lattice sites. The novel phase has a lower proton mobility than the bcc phase and may exhibit a higher melting temperature. We predict a transition between the two phases at a pressure of 1±0.5  Mbar, with potential consequences for the interiors of ice giants such as Uranus and Neptune.

• Publication year

  2012

• Venue

  Physical Review Letters

• Publication date

  2012-11-27

• Fields of study

  Medicine, Physics, Environmental Science

• Identifiers
  DOI 10.1103/PhysRevLett.110.151102arXiv 1211.6482PMID 25167242
• 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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