Effect of PbTe on Thermoelectric Properties of Co0.88Ni0.12Sb2.91Sn0.09
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The Co0.88Ni0.12Sb2.91Sn0.09 compound was synthesized by a metallurgical route, and PbTe powder was prepared by the low-temperature aqueous chemical method. Composite materials (xPbTe/Co0.88Ni0.12Sb2.91Sn0.09) were prepared by the ball-milling and the hot-pressed process. Electrical conductivities of xPbTe/Co0.88Ni0.12Sb2.91Sn0.09 hot-pressed samples decrease with increase of PbTe content, but their thermal conductivities were effectively improved due to induction of disperse phase. Due to agglomeration of the disperse phase, little thermal conductivity improvement occurs for composite material with low PbTe content. The ZT values of xPbTe/Co0.88Ni0.12Sb2.91Sn0.09 samples were hardly enhanced due to the negative contribution of electrical conductivity.
KeywordsThermoelectric materials Composite material Thermoelectric properties Thermal conductivity
The authors acknowledge support by Natural Science Foundation of China under Grant No. 50801054.
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