Figure 2
[100] difference-Fourier maps at (a) x = 0.0781 and (b) at x = 0 from a refinement of mimetite in the space group P63/m. (a) Area of excess nuclear density indicating the splitting of the O2 and O3 atoms; (b) areas of excess nuclear density indicated near (0, 0, ¼) of the apatite channel, which is a site commonly occupied by smaller anions such as oxygen. |