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Figure 4
The definition and numbering of four rhombohedral domain variants. The direction of the unique axis (threefold symmetry axis in this case) is given relative to the basis vectors aim. These directions coincide with the direction of the spontaneous polarization for the case where the structure is polar. The basis vectors of the paraelastic phase ai0 are shown in the figure.

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ISSN: 2053-2733
Volume 78| Part 3| May 2022| Pages 158-171
https://doi.org/10.1107/S2053273322002534
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