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Figure 1
Schematic diagrams of the polarization rotation paths for Pb displacement vectors in the monoclinic mirror planes in the (a) MA/MB and (b) MC structures discussed in Zhang, Yokota et al. (2017BB15). The large red atom at the centre of the unit cell is Pb, while the blue atoms are the surrounding O atoms of the PbO12 cage. The small yellow atoms are the B-site cations Zr or Ti. Arrows indicate possible vector directions.

IUCrJ
Volume 5| Part 1| January 2018| Pages 1-3
ISSN: 2052-2525
https://doi.org/10.1107/S2052252517018474