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28 March 2024
 
  » arxiv » 1211.6482

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Superionic to superionic phase change in water: consequences for the interiors of Uranus and Neptune
Hugh F. Wilson ; Michael L. Wong ; Burkhard Militzer ;
Date 28 Nov 2012
AbstractUsing density functional molecular dynamics free energy calculations, we show that the body-centered-cubic 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 fcc lattice sites. The novel phase has a lower proton mobility than the bc 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.
Source arXiv, 1211.6482
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