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Figure 1
Schematic illustration of the MA/MB monoclinic domains and numeration of their variants. (a) The unit-cell distortion along with the rotation of the SPD (if such polarization is present). (b) The stereographic projection, showing these directions for the domains of tetragonal (red squares), rhombohedral (green triangles) and monoclinic (blue circles) symmetry. The tetragonal domains (1), (2), (3) correspond to the SPD along [100], [010] and [001], respectively. The rhombohedral domains (1), (2), (3) and (4) correspond to the SPD along [111], [111], [111] and [111] directions, respectively. The SPDs within the 12 monoclinic domains are further explained in Table 1[link].

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ISSN: 2053-2733
Volume 80| Part 1| January 2024| Pages 112-128
https://doi.org/10.1107/S205327332300921X
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