中文摘要：

用水热法制备了晶粒尺寸为几十纳米到几百纳米的Bi_2Te_3粉末,再通过压片法制得不同孔隙率的Bi_2Te_3薄片材料,研究了孔隙率对Bi_2Te_3热电性能的影响。通过对热电性能的测试,研究发现压片法制得的Bi_2Te_3样品具有较高的孔隙率,且样品的热传导符合多孔材料的热传导规律。当Bi_2Te_3样品孔隙率较大时具有较低的热导率,在室温下测得孔隙率为43%的Bi_2Te_3薄片热导率为0.282W·m~（-1）·K~（-1）。材料热导率、电导率和ZT值均随孔隙率的增加而减小。

英文摘要：

Bi2Te3 nano-powder with an average diameter ranging from several to hundred nanometers was prepared via hydrothermal synthesis. Bi2Te3 tablets with different porosity were tableting by powders. The effect of porosity on the thermoelectric performance of Bi2Te3 was discussed. The results show that the Bi：Te3 tablets with higher porosity have remarkably lower thermal conductivity. When the porosity of Bi2Te3 is 43%, the thermal conductivity is 0.282 W. m-1. K1. With the increase of porosity, the thermal conductivity, electrical conductivity and ZT values decrease.