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and
) and A-site cation ordering (
).| Irreps | OPD | SG | MR |
|---|---|---|---|
 ⊕
|
(η1,η1;η1) |
P 21m
|
Rotation+ACO |
 ⊕
|
(η1,η2;η1) | P21212 | Rotation+ACO |
 ⊕ ⊕
|
(0,η1;η2,0;η1) | Pca21 | Rotations+ACO |
ACO, A-site cation ordering; MR, mode representation; OPD, order parameter direction; SG, space group; ⊕, coupled distortions.
