Electrical Properties of P-type Thermoelectric Ag_xBi_(0.5)Sb_(1.5-X)Te_3 (x=0.05～0.4) Alloys Prepared by Spark Plasma Sintering

摘要

Thermoelectric Ag-Bi-Sb-Te alloys with the general formula Ag_xBi_(0.5)Sb_(1.5-x)Te_3 (x =0.05～0.4) were prepared by spark plasma sintering and their electrical properties were examined. The alloys exhibit large electrical conductivities in the whole temperature range, which are approximate 11.0 and 3.5 times those of pseudo-binary Bi_(0.5)Sb_(1.5)Te_3 alloy at room temperature and 558K, respectively. The highest power factor value of 1.80×10~(-3) (W.K~(-2)m~(-1)) is obtained for the material (x = 0.1) at the temperature of 412K, being about 2.4 times that of pseudo-binary alloy Bi_(0.5)Sb_(1.5)Te_3 at the corresponding temperature.