Development of Bi-Sb-Te ternary alloy with compositionally graded structure

摘要

Compositionally graded p-type Bi-Sb-Te thermoelectric material was synthesized by PIES (Pulverized and Intermixed Elements Sintering) method. The materials consisted of three segment regions of different alloy composition, i.e.6 chemical bounds 0.8/0.825/0.9 in (Bi_2STe_3)_(1-y)(Sb_2Te_3)_y system. It was found that the elelctrical power output of the compositionally graded material was larger than that of the best single composition material when the temperature difference was the designed value.