Ice IX is a form of solid
water
Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as ...
stable at temperatures below 140
K or -133.15
C and pressures between 200 and 400
MPa
MPA or mPa may refer to:
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. It has a
tetragonal
In crystallography, the tetragonal crystal system is one of the 7 crystal systems. Tetragonal crystal lattices result from stretching a cubic lattice along one of its lattice vectors, so that the cube becomes a rectangular prism with a squar ...
crystal
A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions. In addition, macro ...
lattice
Lattice may refer to:
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and a density of 1.16 g/cm
3, 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 hydrogen-ordered.
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
* Bridgman, P. W. (1937) J. Chem. Phys. 5, 964.
*
External links
London South Bank University Report
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Water ice