| 摘要 |
The present invention relates to a thermoelectric material containing CoSb3 compound for converting heat to electricity, and provides a p-type thermoelectric material of CoSb3 having a high power factor by achieving high Seebeck coefficient consistently with high electric conductivity in a material of CoSb3 system without causing increase in heat conductivity. By sintering Co0.07Pt0.03Sb3 alloy powder using the spark plasma sintering technique, the material is densified, while growth of grains is restricted, so that a higher electric conductivity is achieved with a heat conductivity maintained in a low level, and the figure of merit as a heat-transfer material is improved. Also, by providing such heat insulating layer as an oxide intermediately in a grain boundary of a compound of CoSb3 in a sintered body, the heat conductivity is reduced. Further, the Seebeck coefficient is increased by adding a rare earth metal to the thermoelectric material of CoSb3, and allowing it to be precipitated in grain boundaries of the sintered body. <IMAGE> |
