Abstract
Oxide ceramics with nominal composition of La0.8Sr0.2Co1-xMnxO3(0⩽x⩽0.05) were grown by using the citrate sol–gel method followed by high temperature sintering. The thermoelectric properties were studied in the temperature range between 100 and 290K. The magnitude of Seebeck coefficient S(T) and electrical resistivity ρ(T) increases with the manganese doping level, reaching maximum values close to 180μV/K and 4mΩcm, respectively. On the contrary, the total thermal conductivity κ(T) decreases with the manganese content. The behavior of S(T) and ρ(T) was interpreted in terms of small-pollaron hopping mechanism. From S(T), ρ(T) and κ(T) data it was possible to calculate the dimensionless thermoelectric figure of merit ZT, which reaches maximum values close to 0.12; the structural and morphological properties of the samples were studied by powder X-ray diffraction analysis and scanning microscopy (SEM), respectively.
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