出典:Wikipedia
出典:『Wikipedia』 (2011/05/09 16:48 UTC 版)
Ice VII is a cubic crystalline form of ice. It has a triple point with liquid water and Ice VI at 355 K and 2.216 GPa, with the melt line extending to at least 715 K and 10 GPa. It can also be reached in the solid state by increasing the pressure on ice VI at ambient temperature. Like the majority of ice phases (including ice Ih), the hydrogen atom positions are disordered. In addition, the oxygen atoms are disordered over multiple sites. The structure of ice VII comprises a hydrogen bond framework in the form of two interpenetrating (but non-bonded) sub-lattices.