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We report a temperature-dependent Raman scattering investigation of DyScO3and GdScO3 single crystals from room temperature up to 1200 {\deg}C. Withincreasing temperature, all modes decrease monotonously in wavenumber withoutanomaly, which attests the absence of a structural phase transition. The hightemperature spectral signature and extrapolation of band positions to highertemperatures suggest a decreasing orthorhombic distortion towards the idealcubic structure. Our study indicates that this orthorhombic-to-cubic phasetransition is close to or higher than the melting point of both rare-earthscandates (\approx 2100 {\deg}C), which might exclude the possibility of theexperimental observation of such a phase transition before melting. Thetemperature-dependent shift of Raman phonons is also discussed in the contextof thermal expansion.

Temperature-dependent Raman scattering of DyScO3 and GdScO3 single crystals