Figure 5
Part of the crystal structure of (2), showing the five-coordination of two independent Na ions. Atoms marked with a single or double star (*) or a single or double hash (#) are at the symmetry positions (-1 + x, -1 + y, z), (1 + x, 1 + y, z), (-x, -y, 1 - z) and (1 - x, -y, 2 - z), respectively. |