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arXiv 1306.5704cond-mat.mtrl-sci
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水冰的分解和四帕斯卡相

Decomposition and terapascal phases of water ice

Chris J. Pickard, Miguel Martinez-Canales, Richard J. Needs

摘要:

计算搜索的稳定和亚稳结构的水冰和其他H:O组合物在TPa的压力,使我们预测,H $_2$ O分解成H $_2$ O $_2$和富氢相在压力略高于5 TPa。富氢相在很宽的氢含量范围内是稳定的,当H $_2$ O与氢接触时,它可能在气体巨星核心的冰成分的侵蚀中发挥作用。金属化的H $_2$ O的预测在一个较高的压力略高于6 TPa,因此H $_2$ O不具有化学稳定的低温金属形式。我们还发现了一种新的、丰富的复杂的水冰相矿物学,它在0.8- 2 TPa压力范围内比以前预测的任何一种都要稳定。

英文摘要:

Computational searches for stable and metastable structures of water ice and other H:O compositions at TPa pressures have led us to predict that H$_2$O decomposes into H$_2$O$_2$ and a hydrogen-rich phase at pressures of a little over 5 TPa. The hydrogen-rich phase is stable over a wide range of hydrogen contents, and it might play a role in the erosion of the icy component of the cores of gas giants as H$_2$O comes into contact with hydrogen. Metallization of H$_2$O is predicted at a higher pressure of just over 6 TPa, and therefore H$_2$O does not have a thermodynamically stable low-temperature metallic form. We have also found a new and rich mineralogy of complicated water ice phases which are more stable in the pressure range 0.8--2 TPa than any predicted previously.

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