Abstract
The present work describes the effect of Lanthanum substitution on the thermoelectric properties of Calcium Manganate. The n-type LaxCa1-xMnO3 (0 ≤ x ≤ 0.1) perovskite ceramics were synthesized by Solid State Reaction method. The variation in the cell parameters, electrical conductivity and thermoelectric power factor with the increase of La concentration in Calcium Manganate was investigated. The incorporation of La in the A-site was found to shift the X-Ray Diffraction peak position to lower angles indicating an increase in unit cell volume. The lowest value of resistivity was obtained for x = 0.10, which is several orders lower than that of pure/ undoped Calcium Manganate ceramics. However, due to the inverse dependence of the Seebeck coefficient on carrier concentration, the value of Seebeck coefficient was found to be low for x = 0.10 samples. The highest value of the power factor was about 225 μW m-1 K-2at 1075 K in La substituted samples which is about two orders higher than the undoped Calcium Manganate samples.
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