Irrep amplitude (in \AA) value after the refinement for \operatorname{SrPr} M R u \mathrm{O}_{6}(M=\mathrm{Zn}, \mathrm{Co}, \mathrm{Mg}, \mathrm{Ni}) compounds at room temperature for cubic ( F m \overline{3} m) to monoclinic ( P 2_{1} / n) phase transition; from which \mathrm{GM}_{4}^{+} and X_{3}^{+}irreps are the ones breaking the symmetry.
| Irrep | Isotropy subgroup | Dim | K-vector | Direction | Amplitude | |||
|---|---|---|---|---|---|---|---|---|
| Zn | Co | Mg | Ni | |||||
| \mathrm{GM}_{1}^{+} | Fm \overline{3} m (225) | 1 | (0,0,0) | (a) | 0.04(1) | 0.026(7) | 0.00(2) | 0.00(1) |
| \mathrm{GM}_{3}^{+} | I4/mmm (139) | 1 | (0,0,0) | (\mathrm{a}, 0) | 0.04(2) | 0.02(2) | 0.04(3) | 0.03(1) |
| \mathrm{GM}_{4}^{+} | C2/m (12) | 1 | (0,0,0) | (a,a,0) | 1.155(4) | 1.094(4) | 1.026(4) | 1.075(4) |
| \mathrm{GM}_{5}^{+} | C2/m (12) | 4 | (0,0,0) | (-b,a,-a) | 0.16(2) | 0.11(2) | 0.18(2) | 0.10(2) |
| \mathrm{X}_{2}^{+} | P 4_{2} / m n m (136) | 1 | (0,1,0) | (0,a,0) | 0.006(6) | 0.021(9) | 0.012(9) | 0.011(8) |
| \mathrm{X}_{3}^{+} | P4/mnc (128) | 1 | (0,1,0) | (0,a,0) | 0.843(5) | 0.777(5) | 0.737(6) | 0.761(5) |
| \mathrm{X}_{5}^{+} | Pnnm (58) | 3 | (0,1,0) | (a,a,0,0,a,-a) | 0.404(4) | 0.378(7) | 0.285(6) | 0.338(6) |
| R_{\mathrm{p}}(\%) | 3.43 | 2.26 | 3.07 | 3.72 | ||||
| R_{\mathrm{wp}}(\%) | 4.58 | 2.96 | 4.66 | 4.98 | ||||
| R_{\text {exp }} (%) | 3.00 | 3.84 | 3.89 | 3.94 | ||||
| \chi^{2} | 2.34 | 0.60 | 1.43 | 1.60 | ||||
| R_{\text {Bragg }}(\%) | 4.51 | 3.89 | 3.60 | 3.07 |