Bulk moduli and equations of state of ice VII and ice VIII

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Other Title
  • 氷VII相およびVIII相の体積弾性率と状態方程式

Description

The compression behaviour of deuterated ice VII and VIII was investigated by high pressure neutron scattering in the pressure range 2-13.7 GPa between 93 K and 300 K. We establish equations-of-state which contain accurate values for the bulk moduli B${}_{0}$, their pressure derivatives B'${}_{0}$, as well as the ambient pressure volumina V${}_{0}$. These equations-of-state hold over a large part of the stability domain of ice VII, by comparison with available X-ray data, and to at least ${\approx}$ 13 GPa for ice VIII. They are indistinguishable at low pressures, but beyond ${\approx}$ 7 GPa and at low temperatures ice VIII appears to become stiffer than expected. This might be related to an anomalous phonon hardening observed previously in ice VIII in this $P/T$ range [D.D. Klug et al., Physical Review B, 70, 144113 (2004)].

Journal

  • Physical Review B

    Physical Review B 95 (17), 174111_1-174111_7, 2017-05

    American Physical Society (APS)

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