Equations of state of ice VI and ice VII at high pressure and high temperature

Abstract : High-pressure H2O polymorphs among which ice VI and ice VII are abundant in the interiors of large icy satellites and exo-planets. Knowledge of the elastic properties of these pure H2O ices at high-temperature and high-pressure is thus crucial to decipher the internal structure of icy bodies. In this study we assess for the first time the pressure-volume-temperature ( PVT) relations of both polycrystalline pure ice VI and ice VII at high pressures and temperatures from 1 to 9 GPa and 300 to 450 K, respectively, by using in situ synchrotron X-ray diffraction. The PVT data are adjusted to a second-order Birch-Murnaghan equation of state and give V-0 = 14.17(2) cm(3) mol(-1), K-0 = 14.05(23) GPa, and alpha(0) = 14.6(14) x 10(-5) K-1 for ice VI and V-0 = 12.49(1) cm(3) mol(-1), K-0 = 20.15(16) GPa, and alpha(0) = 11.6(5) x 10(-5) K-1 for ice VII. (c) 2014 AIP Publishing LLC.
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Lucile Bezacier, Baptiste Journaux, Jean-Philippe Perrillat, Herve Cardon, Michael Hanfland, et al.. Equations of state of ice VI and ice VII at high pressure and high temperature. Journal of Chemical Physics, American Institute of Physics, 2014, 141 (10), ⟨10.1063/1.4894421⟩. ⟨hal-02350694⟩

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