title: Superionic to superionic phase change in water: consequences for the interiors of uranus and neptune.
abstract: 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.
authors.affiliation: Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
authors.forename: Hugh F
authors.initials: HF
authors.lastname: Wilson
authors.affiliation: Department of Earth and Planetary Science, University of California, Berkeley, California 94720, USA.
authors.forename: Michael L
authors.initials: ML
authors.lastname: Wong
authors.affiliation: Department of Earth and Planetary Science and Department of Astronomy, University of California, Berkeley, California 94720, USA.
authors.forename: Burkhard
authors.initials: B
authors.lastname: Militzer