| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1487782 | Materials Research Bulletin | 2015 | 5 Pages |
•Systematical studies on the thermoelectric properties of SmBaCuFeO5 are few.•The electrical conductivity has been increased about 2 orders of magnitude.•A rough measurement of band gap of this class ceramic for the first time.•As oxide thermoelectric materials, the thermal conductivity is relatively low.•The maximum ZT of 0.042 at 1023 K is obtained for Sm0.6La0.4BaCuFeO5.
La-doped SmBaCuFeO5 polycrystalline ceramics have been prepared through sol–gel method followed by solid-state sintering reaction. A significant enhancement in the thermoelectric properties of SmBaCuFeO5 has been achieved by La doping. Our results reveal that the La doping can lead to a remarkable increase in the electrical conductivity of 2 orders of magnitude. The Seebeck coefficient decreases with increasing La content, which is consistent with the increased electrical conductivity. Thermal conductivity at room temperature decreases from 2.1 W m−1 K−1 to 1.7 W m−1 K−1 due to the existence of nano-sized grains in the high substitutive content samples. The maximum ZT of 0.042 at 1023 K is obtained for Sm0.6La0.4BaCuFeO5, which is 13 times more than that of the pristine sample.
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