Structural details and phase transition temperatures of the title compounds. The data shown are as follows: literature reference (‘Ref.’); lattice constants (a, c); \mathrm{M}-\mathrm{O} 1 and \mathrm{M}-\mathrm{O} 2 distances inside the \mathrm{MO}_{6} octahedra ( d_{1}, d_{2}); angle of rotation of the \mathrm{WO}_{6} octahedra around the c axis (\varphi); temperature of the phase transition from the tetragonal to the cubic phase \left(T_{\mathrm{c}}\right); pseudosymmetry parameter for the F m \overline{3} m space group ( \Delta). ‘PW’ stands for present work.
| Compound | Ref. | a(\AA) | c(\AA) | c / a \sqrt{2} | d_{1}(\AA) | d_{2}(\AA) | d_{2} / d_{1} | \varphi (deg) | T_{\mathrm{c}}\left({ }^{\circ} \mathrm{C}\right) | \Delta(\AA) |
|---|---|---|---|---|---|---|---|---|---|---|
| \mathrm{Sr}_{2} \mathrm{NiWO}_{6} | ||||||||||
| [37] | 5.56 | 7.91 | 1.01 | - | - | - | - | 400 | - | |
| [26] | 5.575 | 7.918 | 1.004 | - | - | - | - | 300 | - | |
| [38] | 5.559 | 7.918 | 1.007 | - | - | - | - | 260 | - | |
| [13] | 5.559 | 7.918 | 1.007 | 2.029 | 2.051 | 1.011 | 1.4 | 307 | 0.09 | |
| [39] | 5.5571 | 7.9131 | 1.0069 | 2.042 | 2.018 | 0.988 | 7.3 | - | 0.49 | |
| PW | 5.5608 | 7.9191 | 1.0070 | 2.029 | 2.027 | 0.999 | 8.3 | 315 | 0.56 | |
| \mathrm{Sr}_{2} \mathrm{ZnWO}_{6} tetragonal | [37] | 5.60 | 8.01 | 1.0114 | - | - | - | - | 570 | - |
| [26] | 5.579 | 7.976 | 1.0109 | - | - | - | - | 430 | - | |
| [20] | - | - | - | - | - | - | - | 400{ }^{\text {a }} | - | |
| PW { }^{\mathrm{b}} | 5.5973 | 7.9889 | 1.0092 | 2.034 | 2.068 | 1.016 | 10.3 | 500 | 0.71 | |
| \mathrm{Sr}_{2} \mathrm{CoWO}_{6} | ||||||||||
| [37] | 5.58 | 7.98 | 1.0112 | - | - | - | - | - | - | |
| [26] | 5.596 | 7.978 | 1.0081 | - | - | - | - | 400 | - | |
| PW | 5.5820 | 7.9774 | 1.0106 | 2.092 | 2.090 | 0.999 | 8.7 | 430 | 0.58 | |
| \mathrm{Sr}_{2} \mathrm{CuWO}_{6} | ||||||||||
| [40] | 5.42 | 8.40 | 1.10 | - | - | - | - | - | - | |
| [41] | 5.431 | 8.410 | 1.095 | - | - | - | - | 920 | - | |
| [14, 20] { }^{\text {c }} | 5.422 | 8.395 | 1.095 | 1.9384 | 2.2834 | 1.1780 | 8.9 | 897 | 0.60 | |
| [42] | 5.42693 | 8.4087 | 1.0956 | 1.9604 | 2.3250 | 1.1860 | 10.5 | - | 0.70 | |
| [43] | 5.4315 | 8.4024 | 1.0939 | - | - | - | - | - | - | |
| [44] | 5.4290 | 8.4155 | 1.0961 | 1.9339 | 2.3227 | 1.2010 | 8.6 | - | 0.58 | |
| PW | 5.4291 | 8.4154 | 1.0961 | 1.955 | 2.322 | 1.188 | 10.9 | 920 | 0.74 |