- Ice IX
Ice IX is a metastable form of solid
water stable at temperatures below 140 K and pressures between 200 and 400MPa . It has atetragonal crystal lattice and a density of 1.16 g/cm³, 26% higher than ordinary ice. It is formed by coolingice III from 208 K to 165 K (rapidly to avoid formingice II ). Its structure is identical to ice III other than being proton-ordered.Ordinary water ice is known as ice Ih in the Bridgman nomenclature. Different types of ice, from ice II to
ice XIV , have been created in the laboratory at different temperatures and pressures.References
* Bridgman, P. W. (1937) J. Chem. Phys. 5, 964.
*cite web |url=http://www.lsbu.ac.uk/water/ice_iii.html |title=Ice-three and ice-nine structures |accessdate=2008-01-02 |author=Chaplin, Martin |date=2007-11-11 |work=Water Structure and ScienceExternal links
* [http://www.lsbu.ac.uk/water/phase.html London South Bank University Report]
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