Bulk moduli and equations of state of ice VII and ice VIII
Bulk moduli and equations of state of ice VII and ice VIII
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DOI：
10.1103/physrevb.95.174111
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发表时间：
2017-05-30
影响因子：
3.7
通讯作者：
Hattori, T.
中科院分区：
文献类型：
--
作者：
Klotz, S.;Komatsu, K.;Hattori, T.
用高压中子散射方法研究了氘代冰VII和VIII在93 ~ 300 K、2 ~ 13.7 GPa压力范围内的压缩行为。我们建立状态方程，其中包含体积模量B-0、它们的压力导数B '（0）以及环境压力体积V-0的精确值。通过与现有的X射线数据进行比较，这些状态方程在冰VII的大部分稳定域上保持不变，并且对于冰VIII至少接近13 GPa。它们在低压下无法区分，但超过约7 GPa，在低温下，冰VIII似乎变得比预期的更硬。这可能与以前在冰VIII中观察到的P/T范围内的异常声子硬化有关[D. D. Klug等人，Phys. Rev. B 70，144113（2004）]。
The compression behavior of deuterated ice VII and VIII was investigated by high pressure neutron scattering in the pressure range 2-13.7 GPa between 93 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 volume 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 approximate to 13 GPa for ice VIII. They are indistinguishable at low pressures, but beyond approximate to 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., Phys. Rev. B 70, 144113 (2004)].