Earth: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]
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
- ↑ Water, in the Liquid and Five Solid Forms, under Pressure P.W. Bridgman (1912), www.jstor.org, retrieved 3 October 2019
- ↑ "Titan - in Depth". https://solarsystem.nasa.gov/moons/saturn-moons/titan/in-depth/.
- ↑ Reports: Structure of Ice VI science.sciencemag.org, B. Kamb, 8 October 1965.
- ↑ Water Phase Diagram www1.lsbu.ac.uk, version of 9 September 2019, retrieved 3 October 2019
- ↑ Salzmann CG, Radaelli PG, Mayer E, Finney JL (2009). "Ice XV: a new thermodynamically stable phase of ice.". Phys Rev Lett 103 (10): 105701. doi:10.1103/PhysRevLett.103.105701. PMID 19792330. Bibcode: 2009PhRvL.103j5701S. https://pubmed.ncbi.nlm.nih.gov/19792330.
- ↑ Yamane R, Komatsu K, Gouchi J, Uwatoko Y, Machida S, Hattori T, Kagi H (2021). "Experimental evidence for the existence of a second partially-ordered phase of ice VI.". Nat Commun 12 (1): 1129. doi:10.1038/s41467-021-21351-9. PMID 33602936. Bibcode: 2021NatCo..12.1129Y.
External links
- Physik des Eises (PDF in German, iktp.tu-dresden.de)
- Ice phases (www.idc-online.com)
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