Ice VI
Ice VI was discovered by the Nobel prize winner Percy Williams Bridgman in 1912 (Ref. 1). 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 (Ref. 2).
References
- Percy Williams Bridgman "Water in the liquid and five solid forms, under pressure", Proceedings of the American Academy of Arts and Sciences XLVII pp. 441-558 (1912)
- W. F. Kuhs, J. L. Finney, C. Vettier and D. V. Bliss "Structure and hydrogen ordering in ices VI, VII, and VIII by neutron powder diffraction", Journal of Chemical Physics 81 pp. 3612-3623 (1984)
- Barclay Kamb "Structure of Ice VI", Science 150 pp. 205-209 (1965)
- 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)
- 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)
- 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)