Abstract
The CoSb 3 and Y 0.18Co 4Sb 12 compounds were synthesized by a metallurgical route. Their bulk materials were prepared by the hot-pressed process under vacuum. Thermoelectric properties of the samples were measured by the thermoelectric measurement system and the laser flash diffusivity apparatus. The carrier type conversion of hot-pressed CoSb 3 was found at about 530 K, while the conversion was missed for the Y 0.18Co 4Sb 12 sample. Electrical conductivity of the Y 0.18Co 4Sb 12 sample increased due to the increase of carrier concentration, and its thermal conductivity decreased due to the enhancement of phonon scattering. The value of ZT, figure of merit, for the Y 0.18Co 4Sb 12 sample was obviously enhanced due to positive contribution of the electrical conductivity and the thermal conductivity.
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