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The thermoelectric properties of the double perovskite-type oxides Sr21xKxFeMoO6 were investigated in terms of K-doping at the A site of the oxides. The electrical conductivity, ·, of the oxides showed a metallic behavior, decreasing monotonically from ca. 103 S/cm at room temperature to ca. 102 S/cm at 1250K. 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 300K increased up to x = 0.2 and then decreased dramatically for x = 0.3­0.4. 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, S2·, of the oxides increased sharply with increasing K-doping level; the value for Sr1.6K0.4FeMoO6 was ca. 4.2 © 1014W/mK2, which is the highest among all the samples in this study. The thermal conductivity, ¬, of the oxides generally decreased from ca. 3­5W/mK at room temperature to ca. 2­4W/mK at 1100K. Because the power factor of the oxides increased above 900K, the dimensionless figure of merit, ZT = S2·T/¬, increased dramatically above 900K. The largest ZT value of 0.24 was observed for Sr1.6K0.4FeMoO6 at 1250K. ©2012 The Ceramic Society of Japan. All rights reserved.

journal of the ceramic society of japan

Structure and thermoelectric properties of double-perovskite oxides: Sr&lt;sub&gt;2−&lt;/sub&gt;&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;K&lt;i&gt;&lt;sub&gt;x&lt;/sub&gt;&lt;/i&gt;FeMoO&lt;sub&gt;6&lt;/sub&gt;