抄録
The effect of powder particle sizes of n and p-Bi2Te3 on the thermoelectric properties has been studied. The powder was formed from the each ingot and sieved into <63, 63-90 and 90-150μm for p-type, and <355 and >355 μm for n-type. Those powders are pressed followed by CIP, then sinterd at 773K for 7200s. The effects of CIP on the densities were not so large such as 1-4% depending on the powder sizes. The Seebeck coefficients and electric conductivities for p-type were 110μ V/K and 0.8x102Ω-1m-1 at 333K, while 180μ V/K and 2.0x104Ω-1m-1 for n-type, respectively. The thermal conductivity for n-type was 0.7W/mK leading to the figure of merit of 2.1x10-3(/K). The hybrid texture of the suitable amount of smaller and larger grains has a possibility of an improvement for thermoelectric properties.
