Abstract
LaCoO3 ceramics with much enhanced thermoelectric properties were prepared by means of a polyacrylamide gel soft-chemical method and the addition of the sintering aids mixture of B2O3 and CuO. The effects of B2O3–CuO addition on the low-temperature sintering behavior, microstructure and thermoelectric properties of LaCoO3 ceramics were investigated. The results showed that the sintering temperature of LaCoO3 ceramics could be reduced significantly from 1200°C to 1000°C by using B2O3–CuO additions. Although the Seebeck coefficient S of LaCoO3 at a temperature below 200°C decreased with the increase of B2O3–CuO content x (wt.%), the electric conductivity and thermal resistivity were simultaneously enhanced with increasing x as x⩽2.5. Thus, the power factor P of LaCoO3 increased with x, and the sample with x=2.5 sintered at 1000°C was found to have optimum thermoelectric properties with ZT=0.073 at 100°C, which was about 1.5 times higher than that of pure LaCoO3 sintered at 1200°C, indicating that the addition of B2O3–CuO could simultaneously lower the sintering temperature and improve the thermoelectric properties of LaCoO3 ceramics.
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