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arXiv · 1004.1892

Temperature-dependent Raman scattering of DyScO3 and GdScO3 single crystals

O. Chaix-Pluchery·D. Sauer·J. Kreisel
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Abstract

We report a temperature-dependent Raman scattering investigation of DyScO3 and GdScO3 single crystals from room temperature up to 1200 °C. With increasing temperature, all modes decrease monotonously in wavenumber without anomaly, which attests the absence of a structural phase transition. The high temperature spectral signature and extrapolation of band positions to higher temperatures suggest a decreasing orthorhombic distortion towards the ideal cubic structure. Our study indicates that this orthorhombic-to-cubic phase transition is close to or higher than the melting point of both rare-earth scandates (\approx 2100 °C), which might exclude the possibility of the experimental observation of such a phase transition before melting. The temperature-dependent shift of Raman phonons is also discussed in the context of thermal expansion.

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O. Chaix-Pluchery, D. Sauer, J. Kreisel. 2010-04-12. Temperature-dependent Raman scattering of DyScO3 and GdScO3 single crystals. https://doi.org/10.1088/0953-8984%2F22%2F16%2F165901

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