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Ice-thirteen (XIII)

 

Ice-thirteen (XIII)

Ice-thirteen (Ice XIII)

 

Ice-thirteen (ice XIII) is the metastable proton-ordered form of ice-five (shown on the right), formed by doping with10 mM HCl (about one molecule to every 5000 molecules of water) below 130K and at 500 MPa to facilitate the phase transition [1002]. A reversible transition between ice XIII and (metastable) ice V is observed on cycling between 80 and 120 K [1058]. The crystals were monoclinic P21/a with cell dimensions a 9.24 Å, b 7.47 Å and c 10.30 Å (90°, 109.7°, 90°, 28 molecules; at atmospheric pressure and 80 K) and a unit cell contains 28 water molecules (four each of seven distinct types) [1002].

 

Interactive Jmol structure is given.

 

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This page was established in 2006 and last updated by Martin Chaplin on 5 November, 2017


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