Ice VI

Ice VI is a form of ice that exists at high pressure at the order of about 1 GPa (= 10 000 bar) and temperatures ranging from 130 up to 355 Kelvin (−143 °C up to 82 °C); see also the phase diagram of water. Its discovery and the discovery of other high-pressure forms of water were published by P.W. Bridgman in January 1912.[1]

Phase diagram of water

It is part of one of the inner layers of Titan.[2]

Properties

Ice VI has a density of 1.31 g/cm3 and a tetragonal crystal system with the space group P42/nmc; its unit cell contains 10 water molecules and has the dimensions a=6.27 Å and c=5.79 Å.[3] The triple point of ice VI with ice VII and liquid water is at about 82 °C and 2.22 GPa and its triple point with ice V and liquid water is at 0.16 °C and 0.6324 GPa = 6324 bar.[4]

Ice VI undergoes phase transitions into ices XV[5] and XIX [6] upon cooling depending on pressure as hydrochloric acid is doped.

See also

References
  1. Water, in the Liquid and Five Solid Forms, under Pressure P.W. Bridgman (1912), www.jstor.org, retrieved 3 October 2019
  2. "Titan - in Depth".
  3. Reports: Structure of Ice VI science.sciencemag.org, B. Kamb, 8 October 1965.
  4. Water Phase Diagram Archived 2016-03-14 at the Wayback Machine www1.lsbu.ac.uk, version of 9 September 2019, retrieved 3 October 2019
  5. Salzmann CG, Radaelli PG, Mayer E, Finney JL (2009). "Ice XV: a new thermodynamically stable phase of ice". Phys Rev Lett. 103 (10): 105701. arXiv:0906.2489. Bibcode:2009PhRvL.103j5701S. doi:10.1103/PhysRevLett.103.105701. PMID 19792330. S2CID 13999983.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  6. Yamane R, Komatsu K, Gouchi J, Uwatoko Y, Machida S, Hattori T, Kagi H; et al. (2021). "Experimental evidence for the existence of a second partially-ordered phase of ice VI". Nat Commun. 12 (1): 1129. Bibcode:2021NatCo..12.1129Y. doi:10.1038/s41467-021-21351-9. PMC 7893076. PMID 33602936.{{cite journal}}: CS1 maint: multiple names: authors list (link)


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