Ice_vii

Ice VII is a cubic crystalline form of ice formed by lowering the temperature of very hot liquid water to ambient temperatures at pressures somewhat above 2.2 GPaIAPWS, Release on the pressure along the melting and the sublimation curves of ordinary water substance, 1993. Retrieved on 2008-02-22., although it is usually made by increasing the pressure on ice VI at ambient temperature.G.P. Johari, A.Lavergne and E.Whalley, Journal of Chemical Physics Vol 61 p4292 (1974) The hydrogen atom positions are disordered and the hydrogen bonds form two interpenetrating lattices. It exhibits Debye relaxation. The proton-ordered form of ice VII is ice VIII.

Ordinary water ice is known as ice I_h, (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

• Chaplin, Martin (2007-10-26). Ice-seven and ice-ten structures. Water Structure and Science. Retrieved on 2008-01-02.

v • d • e Crystalline forms of ice
Ih • Ic • II • III • IV • V • VI • VII • VIII • IX • X • XI • XII • XIII • XIV • XV

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