Talk:Ice VII

The triple point for ice VII with liquid water and ice VI is 2.2 GPa at 81.6 C. It forms ice VI if below this temperature and pressure. Martin Chaplin (talk) 11:36, 19 February 2008 (UTC)[reply]

At room temperature the transition from ice VI occurs at 2.1 GPa (2.0 in D2o)Yadevol (talk) 12:17, 22 February 2008 (UTC)[reply]

I believe we are both after accuracy here. 2.1 GPa is still below the liquid water triple point and the page seems to indicate that ice VII is forme from the liquid phase. I used 3 GPa as this is the actual pressure originally used. How about the number 2.2 GPa? Martin Chaplin (talk) 12:38, 22 February 2008 (UTC)[reply]

The Johari reference does not refer to the liquid ice VII phase line; is it required? Martin Chaplin (talk) 13:18, 22 February 2008 (UTC)[reply]

I was using the pressure of the ice VI to VII transition at RT which is how most experiments access the phase and for which the Johari reference is a good one. I am not sure why you want to focus on the formation from liquid but what you have written OK although I think the precision to which the pressure is given is rather optimistic. In my experience I wouldn't believe a pressure in this range to better than +/- 0.02 GPa .129.215.196.17 (talk) 10:34, 28 February 2008 (UTC)[reply]

I feel that the whole thing about proton order and disorder in ice needs explanation. Any objections me writing something about this.Yadevol (talk) 10:39, 28 February 2008 (UTC)[reply]