Raman spectra of the monoclinic $\mathrm{Sr}_{2} \mathrm{MSbO}_{6}(\mathrm{M}=\mathrm{La}, \mathrm{Nd}, \mathrm{Sm}$ and Eu$)$ measured at room temperature. Experimental data are in open circles, while the fitted curves are in colored lines.
Raman spectra of the monoclinic \mathrm{Sr}_{2} \mathrm{MSbO}_{6}(\mathrm{M}=\mathrm{La}, \mathrm{Nd}, \mathrm{Sm} and Eu) measured at room temperature. Experimental data are in open circles, while the fitted curves are in colored lines.