Ice IX
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Ice IX is a metastable form of solid water that exists at temperatures below 140K and pressures between 200 and 400 MPa. It has a tetragonal crystal lattice and a density of 1.16 g/cm³, slightly higher than ordinary ice.
Ordinary water ice is known as Ice Ih (in the Bridgman nomenclature). Different types of ice, from ice-II to ice-XII, have been created in the laboratory at different temperatures and pressures.
Ice IX is not to be confused with "Ice-nine", a fictional discovery in the novel Cat's Cradle by Kurt Vonnegut.
[edit] References
- Bridgman, P. W. (1937) J. Chem. Phys. 5, 964.
[edit] External links
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