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Abstract
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 2.1Wm−1K−1 to 1.7Wm−1K−1 due to the existence of nano-sized grains in the high substitutive content samples. The maximum ZT of 0.042 at 1023K is obtained for Sm0.6La0.4BaCuFeO5, which is 13 times more than that of the pristine sample.
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