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.
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