Superionic and metallic states of water and ammonia at giant planet conditions.

  title={Superionic and metallic states of water and ammonia at giant planet conditions.},
  author={Carlo Cavazzoni and Guido Chiarotti and Sandro Scandolo and Erio Tosatti and Maude Bernasconi and Michele Parrinello},
  volume={283 5398},
The phase diagrams of water and ammonia were determined by constant pressure ab initio molecular dynamic simulations at pressures (30 to 300 gigapascal) and temperatures (300 to 7000 kelvin) of relevance for the middle ice layers of the giant planets Neptune and Uranus. Along the planetary isentrope water and ammonia behave as fully dissociated ionic, electronically insulating fluid phases, which turn metallic at temperatures exceeding 7000 kelvin for water and 5500 kelvin for ammonia. At lower… CONTINUE READING
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