Mode amplitude (in \AA) value after the refinement for \operatorname{SrPr} M \operatorname{RuO}_{6}(M=\mathrm{Mg}, \mathrm{Ni}) compounds at 1173 K and 1200 K, respectively, for the cubic (F m \overline{3} m) to trigonal (R \overline{3}) phase transition; refining (a) all modes, (b) three and (c) one highest amplitude modes. (Note: K-vector: \mathrm{GM}_{1}^{+}(0,0,0), \mathrm{GM}_{4}^{+}(0,0,0), \mathrm{GM}_{5}^{+}(0,0,0). Direction: \mathrm{GM}_{1}^{+}(a), \mathrm{GM}_{4}^{+}(a, a, a), \mathrm{GM}_{5}^{+}(a, a, a).)
| Irrep | Mode | Isotropy subgroup | Amplitude | |||||
|---|---|---|---|---|---|---|---|---|
| Mg | Ni | |||||||
| (a) | (b) | (c) | (a) | (b) | (c) | |||
| \mathrm{GM}_{1}^{+} | A1 | F m \overline{3} m | -0.03(2) | 0.00 | 0.00 | 0.03(2) | 0.00 | 0.00 |
| \mathrm{GM}_{4}^{+} | A2 | R \overline{3} | -0.566(7) | -0.567(6) | -0.584(4) | -0.628(8) | -0.608(8) | -0.613(5) |
| \mathrm{GM}_{5}^{+} | A3 | R \overline{3} m | -0.06(2) | -0.06(2) | 0.00 | 0.11(4) | 0.03(2) | 0.00 |
| A4 | -0.16(2) | -0.14(2) | 0.00 | 0.09(3) | 0.16(2) | 0.00 | ||
| R_{\mathrm{p}} (%) | 4.41 | 4.27 | 4.30 | 4.22 | 4.29 | 4.26 | ||
| R_{\mathrm{wp}} (%) | 6.40 | 6.32 | 6.35 | 5.55 | 5.68 | 5.65 | ||
| R_{\text {exp }} (%) | 5.68 | 5.67 | 5.68 | 3.30 | 3.30 | 3.30 | ||
| \chi^{2} | 1.27 | 1.23 | 1.25 | 2.83 | 2.96 | 2.92 | ||
| R_{\text {Bragg }} (%) | 12.2 | 11.5 | 11.6 | 12.4 | 12.0 | 11.5 |