Figure 3
Penkvilksite-2O seen (a) along [010], showing the channels delimited by Si tetrahedra (light; yellow in the electronic version of the paper) only, and (b) along [001], showing the channels delimited by Si tetrahedra and Ti1 octahedra (dark, blue). Light (orange) and dark (cyan) circles represent, respectively, Na1 and water O atoms. |