Figure 5
A Cerius2 (Molecular Simulations Inc., 1997) view of the φ-Bi8Pb5O17 structure normal to the (101) plane, showing (exaggerated for clarity by using a probe with radius 0.5 Å) the free volume surface. The cavities are interconnected forming channels normal to the view direction, which can be related to possible migration paths for O atoms. |