高压合成AgSbTe_2-Sb_2Te_3的热电性能研究

Thermoelectric Properties of AgSbTe_2-Sb_2Te_3 Prepared by High Pressure Synthesis

利用高压方法,合成了富Sb2Te3的AgSbTe2热电材料(AgSbTe2)1-x(Sb2Te3)x(0≤x≤0.3),并对其结构和热电性质进行了研究。结果表明:(AgSbTe2)1-x(Sb2Te3)x样品为近单相的AgSbTe2材料;随着制备压力和Sb2Te3掺杂量的增加,(AgSbTe2)1-x(Sb2Te3)x的电阻率大幅降低;Seebeck系数在高压作用下变小,而少量掺杂Sb2Te3却能提高Seebeck系数;在高压和微量掺杂Sb2Te3的共同作用下,AgSbTe2的功率因子得到了提高;2.0 GPa高压下,制备的Ag0.9Sb1.1Te2.1的品质因子达到0.466,接近Bi2Te3的品质因子。

The p-type thermoelectric materials of AgSbTe2 alloyed with Sb2Te3 （（AgSbTe2）1-x （Sb2Te3）x,0≤x≤0. 3） are prepared by high pressure method. The structure and thermoelectric properties of （AgSbTe2）1-x（Sb2Te3）x are studied at room temperature. Experimental results indicate that the samples are near single phase AgSbTe2 when x≤0.1. The electrical resistivity of the sample decreases dramatically with the increasing of synthetic pressure and Sb2 Tea content x. The Seebeck coefficient increases. The high pressure combining with Sb2Te3 doping can improve the power factor of AgSbTe2 effectively. Moreover,the enhanced power factor reaches 10.4μW/（cm ·K2） ,and the high figure of merit reaches 0. 466 for （AgSbTe2）0.9 （Sb2Te3）0.1 prepared at 2.0 GPa,which is close to that of Bi2Te3.