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Figure 1
Octahedral framework of the ideal cubic perovskite showing the structure with (a) in-phase and (b) out-of-phase octahedral tilting, described by Glazer tilt notations a0a0c+ and a0a0c−, respectively. B-centred octahedra and X atoms are shown in yellow and red, respectively.

IUCrJ
Volume 8| Part 4| July 2021| Pages 485-513
ISSN: 2052-2525
https://doi.org/10.1107/S2052252521005418