Thermoelectric sintered glass-ceramics with a Bi2Sr2Co2O x phase
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Glass-ceramic materials containing Bi2Sr2Co2O x crystals with plate-like structures are prepared by a melting process and a subsequent sintering step after manual quenching. The chemical starting compositions of the samples are Bi2Sr2Co2O x (BSC222), Bi1.8Sr2Co2O x (Bi1.8) and Bi2Sr2Co1.7O x (Co1.7). All three samples are p-type conductors. The electric properties of Seebeck coefficient S and electrical resistivity ρ show only a slight dependence on chemical composition. The Seebeck values increase with increasing temperature, and at T = 873 K, they reach S = 180, 176 and 167 µV/K, respectively. The electrical resistivity slightly decreases with temperature for two samples and increases for the Co1.7 sample. The thermal conductivity for all measured samples at this temperature is around κ = 0.8 W/(m K). The figure of merit ZT increases with temperature for all samples. The materials reach a ZT value of 0.03 at T = 873 K.
KeywordsElectrical Resistivity Power Factor Thermoelectric Property PbTe Bi2Te3
The authors would like to thank Dr. Lydia Sosa-Vargas of the National Institute of Advanced Industrial Science and Technology (AIST Ikeda, Osaka) for her help and guidance during the XRD measurements.