Ice III

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]

This article is about the form of water. For the German high-speed train, see ICE 3.
Phase diagram of water, showing the region where ice III is stable.

Ordinary water ice is known as ice Ih, (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
  1. "Ice III (ice-three) structure". 2012-02-04. Archived from the original on 2012-02-04. Retrieved 2023-06-06.
  2. doktorholz (2018-12-17). "Ice III and IX". The Fascination of Crystals and Symmetry. Retrieved 2022-10-17.
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