Thermal conductivity of rare-earth scandates in comparison to other oxidic substrate crystals

Julia Hidde; Christo Guguschev; Steffen Ganschow; Detlef Klimm

doi:10.1016/j.jallcom.2017.12.172

paper

Thermal conductivity of rare-earth scandates in comparison to other oxidic substrate crystals

arXiv:1711.01078 · doi:10.1016/j.jallcom.2017.12.172

Abstract

High-temperature thermal properties of three neighboring rare-earth scandates DyScO $_{3}$ , TbScO $_{3}$ and GdScO $_{3}$ were compared to La $_{0.29}$ Sr $_{0.71}$ Al $_{0.65}$ Ta $_{0.35}$ O $_{3}$ (LSAT) and sapphire. To calculate thermal conductivity, heat capacity and thermal diffusivity were measured by differential scanning calorimetry and laser flash technique, respectively. DyScO $_{3}$ and TbScO $_{3}$ showed an untypical rise in the thermal conductivity above 900\,K, while for GdScO $_{3}$ , LSAT and sapphire the expected decrease at elevated temperatures could be observed. These results lead to the proposal of a new type of heat transport by migrating ions.

15 pages, 4 figures, submitted to J. Alloys. Compd

Thermal conductivity of rare-earth scandates in comparison to other oxidic substrate crystals

Abstract

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