Figure 2
Crystal structures of Ih-C0 and C3 phases, cage structures in C2 and C3 phases.
(a) Ih-C0 structure at 0.5 GPa, (b) C3 structure at 30 GPa, (c) cages formed by water molecules in C3 at 100 GPa, the hydrogen molecules are located at the center of each chair-like H-O ring, (d) cages in “filled ice-Ic” C2, hydrogen molecules are in the center of the cage. Large red and small blue spheres are O and H atoms in water molecules, respectively; the yellow spheres represent the H2 molecules in (a) and (b) and represent H atoms in (c) and (d). Red dashed lines represent hydrogen bonds.
