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• W2000791300 startingPage "211" @default.
• W2000791300 abstract "The thermoelectric properties of the double perovskite-type oxides Sr2−xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, σ, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250 K. The Seebeck coefficient, S, showed that the oxides are of n-type over the measured temperature range. The absolute value of S increased with increasing temperature. The absolute value of S at 300 K increased up to x = 0.2 and then decreased dramatically for x = 0.3–0.4. The Rietveld refinement of the XRD patterns of the oxides suggested that the increase in orbital degeneracy due to the eased distortion of FeO6 and MoO6 octahedra at x = 0.2 was responsible for the |S| maximum at this composition. The power factor, S2σ, of the oxides increased sharply with increasing K-doping level; the value for Sr1.6K0.4FeMoO6 was ca. 4.2 × 10−4 W/mK2, which is the highest among all the samples in this study. The thermal conductivity, κ, of the oxides generally decreased from ca. 3–5 W/mK at room temperature to ca. 2–4 W/mK at 1100 K. Because the power factor of the oxides increased above 900 K, the dimensionless figure of merit, ZT = S2σT/κ, increased dramatically above 900 K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250 K." @default.
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• W2000791300 date "2012-01-01" @default.
• W2000791300 modified "2023-10-16" @default.
• W2000791300 title "Structure and thermoelectric properties of double-perovskite oxides: Sr₂₋<i>_x</i>K<i>_x</i>FeMoO₆" @default.
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• W2000791300 doi "https://doi.org/10.2109/jcersj2.120.211" @default.
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