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Preparations of CaRuO3 Body by Plasma Sintering and Its Thermoelectric Properties

Dense CaRuO 3 body was synthesized by spark plasma sintering (SPS) using CaCO 3 and RuO 2 powders. The second phases of CaO and RuO 2 were identified at the Ru to Ca molar ratio in the source powder (R Ru /Ca) of 0.5 to 0.8 and at R Ru/Ca = 1.1 to 1.4, respectively. A non-stoichiometric solid solution range of bulk CaRuO 3 body was first found in the R Ru/Ca range between 0.7 and 1.0. The density increased with increasing R Ru/Ca and the highest density was 97% at R Ru/Ca = 1.4. The electrical conductivity (σ) decreased with increasing temperature, showing a metallic conduction behavior. The a increased from I x 10 5 to 5 x 10 5 Sm -1 with increasing R Ru/Ca at room temperature (RT). The Seebeck coefficient (S) was around 25 to 35μVK -1 from RT to 1023K independent of composition, exhibiting a p-type conduction. The thermal conductivity (κ) slightly increased with increasing temperature and showed the lowest value at R Ru/Ca = 1.0. The dimensionless figure of merit (ZT) had the maximum at R Ru/Ca = 1.1, and the highest ZT value was 0.034 at 1020 K.