Single phase Ca 1-xSr xRuO 3 (x = 0-1.0) powders were synthesized by a solid-state reaction and compacted by spark plasma sintering. The a-length of the lattice parameter showed a slight minimum around x = 0.6, whereas the b-length, c-length and the unit cell volume increased continuously with increasing x from 0 to 1.0, indicating a solid solution in the whole range. The relative density of Ca 1-xSr xRuO 3 compacted bodies increased from 75 to 95% with increasing x from 0 to 1.0. The electrical conductivity (σ) at x = 0.1-0.9 was higher than those of the end members (CaRuO 3 and SrRuO 3) except for that at x = 0.5, and showed metallic conduction at all compositions. The Seebeck coefficient (S) was 30-40 μV K -1, almost independent of composition and temperature. The thermal conductivity (κ) was 2-3 W m -1 K -1 at room temperature and increased with increasing temperature. The κ showed the lowest values at x = 0.2 in the whole temperature range. The dimensionless figure-of-merit (ZT) at x = 0.1-0.9 was higher than those of the end members. The highest ZT was 0.07 at x = 0.2 and 600 K.
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