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Figure 1
In this figure (a) shows the ideal aristotype structure of the cubic perovskite with general formula ABX3; (b) shows the ideal structure of an n = 1 RP phase (e.g. Sr2TiO4) and (c) shows the aristotype structure of an n = 1 Aurivillius phase [e.g. Bi2TiO4F2 (Needs et al., 2005BB24)]. A, B and X ions are shown in green, blue and red, respectively with BX6 octahedra shown in blue and the [Bi2O2]2+ fluorite-like layers in the Aurivillius structure shown in red.

IUCrJ
Volume 10| Part 4| July 2023| Pages 382-384
ISSN: 2052-2525
https://doi.org/10.1107/S2052252523005559