Figure 4
The eight- (a), nine- (b) and tenfold (c) coordination of barium in a view along c. The atomic coordinates were calculated, respectively, for t = 0.266, u = 0.34; t = 0.671, u = 0; t = 0.529, u = 0.34. Bonds shorter than 3 Å are denoted by a thick line; bonds above 3.4 Å are dashed. (d) A superposition of (a), (b) and (c) with bonds of the tenfold case omitted for clarity. |