Ice VI

Ice VI has a density of 1.31 g cm-3. It has a tetragonal cell of dimensions a = 6.27 Å, c = 5.79 Å, space group P42/nmc. Each cell contains ten water molecules.

References

1. Barclay Kamb "Structure of Ice VI", Science 150 pp. 205-209 (1965)
2. Ove Andersson and G. P. Johari "Spontaneous transformation of water's high-density amorph and a two-stage crystallization to ice VI at 1 GPa: A dielectric study", Journal of Chemical Physics 120 pp. 11662-11671 (2004)
3. Carlos Vega, Carl McBride, Eduardo Sanz and Jose L. F. Abascal "Radial distribution functions and densities for the SPC/E, TIP4P and TIP5P models for liquid water and ices Ih, Ic, II, III, IV, V, VI, VII, VIII, IX, XI and XII", Physical Chemistry Chemical Physics 7 pp. 1450 - 1456 (2005)
4. G. P. Johari, A. Lavergne, and E. Whalley "Dielectric properties of ice VII and VIII and the phase boundary between ice VI and VII", Journal of Chemical Physics 61 pp. 4292-4300 (1974)