 | Acta Crystallographica Section B Acta Crystallographica Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS |
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![[Figure 6]](ck5021fig6mag.jpg)
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Figure 6
Nb and Ti valences for the different (Nb,Ti) sites in Ca5Nb4TiO17 (n = 5) and Ca6(Nb,Ti)6O20 (n = 6). The horizontal axes refer to the (Nb,Ti) sites in the three-dimensional superstructure obtained from the superspace structure model. The (Nb,Ti) atoms are arranged such that the centre of the horizontal axis corresponds to the centre of the slabs, in agreement with Guevarra et al. (2005  ) and Guevarra et al. (2006). BVS parameters have been obtained from Brese & Keeffe (1991) as R0(Nb—O) = 1.911, R0(Ti—O) = 1.815 and R0(Ca—O) = 1.967 Å. |
![[Figure 6]](ck5021fig6.jpg)
| STRUCTURAL SCIENCE CRYSTAL ENGINEERING MATERIALS |
ISSN: 2052-5206
