Editing Ice Ih
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[[Image:Ice_Ih.png|thumb|right]] | [[Image:Ice_Ih.png|thumb|right]] | ||
'''Ice Ih''' | '''Ice Ih''' (hexagonal ice) is a proton disordered [[Ice phases |ice phase]] having the space group P6<sub>3</sub>/mmc. Ice Ih has the following lattice parameters at 250 K: ''a''=4.51842 Å, <math>b=a\sqrt3</math>, and ''c''=7.35556 Å with four molecules per unit cell | ||
(in Table 3 of <ref>[http://dx.doi.org/10.1107/S0108768194004933 K. Röttger, A. Endriss, J. Ihringer, S. Doyle and W. F. Kuhs "Lattice constants and thermal expansion of H2O and D2O ice Ih between 10 and 265 K", Acta Crystallographica Section B '''50''' pp. 644-648 (1994)]</ref>). | (in Table 3 of <ref>[http://dx.doi.org/10.1107/S0108768194004933 K. Röttger, A. Endriss, J. Ihringer, S. Doyle and W. F. Kuhs "Lattice constants and thermal expansion of H2O and D2O ice Ih between 10 and 265 K", Acta Crystallographica Section B '''50''' pp. 644-648 (1994)]</ref>). | ||
The proton ordered form of ice Ih is known as [[ice XI]], which (in principle) forms when ice Ih is cooled to below 72K (it is usually doped with KOH to aid the transition). | The proton ordered form of ice Ih is known as [[ice XI]], which (in principle) forms when ice Ih is cooled to below 72K (it is usually doped with KOH to aid the transition). |