Ice IX

Ice IX is a form of solid water stable at temperatures below 140 K or -133.15 C and pressures between 200 and 400 MPa. It has a tetragonal crystal lattice and a density of 1.16 g/cm³, 26% higher than ordinary ice. It is formed by cooling ice III from 208 K to 165 K (rapidly—to avoid forming ice II). Its structure is identical to ice III other than being completely proton-ordered.^[1]

Ordinary water ice is known as ice I_h in the Bridgman nomenclature. Different types of ice, from ice II to ice XIX, have been created in the laboratory at different temperatures and pressures.

References

↑ La Placa, Sam J.; Hamilton, Walter C.; Kamb, Barclay; Prakash, Anand (1973-01-15). "On a nearly proton‐ordered structure for ice IX". The Journal of Chemical Physics. 58 (2): 567–580. doi:10.1063/1.1679238. ISSN 0021-9606.

Chaplin, Martin (2007-11-11). "Ice-three and ice-nine structures". Water Structure and Science. Retrieved 2008-01-02.

External links

London South Bank University Report

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[1] La Placa, Sam J.; Hamilton, Walter C.; Kamb, Barclay; Prakash, Anand (1973-01-15). "On a nearly proton‐ordered structure for ice IX". The Journal of Chemical Physics. 58 (2): 567–580. doi:10.1063/1.1679238. ISSN 0021-9606.

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