Ice III

Phase diagram of water, showing the region where ice III is stable.

Ice III is a form of solid matter which consists of tetragonal crystalline ice, formed by cooling water down to 250 K at 300 MPa. It is the least dense of the high-pressure water phases, with a density of 1160 kg/m³ (at 350 MPa).^[1] It has a very high relative permittivity at 117 and has a density of 1.16 g/cm³ (making it more dense than water). The proton-ordered form of ice III is ice IX.^[2]

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.

See also

• Ice, for other crystalline forms of ice

References

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