Values after the refinement of the amplitudes (in Å) of the irreps modes, transforming according to the listed irreps, taking part in the symmetry breaking from P m \overline{3} m space group to the room-temperature Amm 2 orthorhombic space group for the \mathrm{Na}_{0.5} \mathrm{K}_{0.5} \mathrm{NbO}_{3} in the present work (PW), compared to the one published in [NKN2] and to \mathrm{KNbO}_{3} in [106].
| Irrep | Amplitude | ||
|---|---|---|---|
| \mathrm{Na}_{0.5} \mathrm{~K}_{0.5} \mathrm{NbO}_{3}(\mathrm{PW}) | \mathrm{Na}_{0.5} \mathrm{~K}_{0.5} \mathrm{NbO}_{3}[\mathrm{NKN} 2] | \mathrm{KNbO}_{3} | |
| \mathrm{GM}_{4}^{-} | 0.38(5) | 0.34(6) | 0.32(1) |
| \mathrm{GM}_{5}^{-} | 0.01(5) | 0.03(4) | 0.04(1) |