Temperature dependence of (a-c) the amplitudes of the modes related to the $P 2_{1} / n, I 2 / m$ and $I 4 / m$ symmetries and (d-f) their corresponding cell parameters, as obtained from NPD and XRD data refinements, for the $\mathrm{Sr}_{2} \mathrm{Co}_{1-x} \mathrm{Mg}_{x} \mathrm{TeO}_{6}$ compounds with ( $x=0.0,0.1,0.2,0.5$)
Temperature dependence of (a-c) the amplitudes of the modes related to the P 2_{1} / n, I 2 / m and I 4 / m symmetries and (d-f) their corresponding cell parameters, as obtained from NPD and XRD data refinements, for the \mathrm{Sr}_{2} \mathrm{Co}_{1-x} \mathrm{Mg}_{x} \mathrm{TeO}_{6} compounds with ( x=0.0,0.1,0.2,0.5)