Abstract: High temperature and high pressure method was utilized to synthesize purephase bulk Bi_0.45Sb_1.55Te₃ thermoelectric samples directly from elemental powders (Bi,Sb,Te) in 30 min. The phase composition and microstructures of the samples were characterized by Xray diffraction, field emission scanning electron microscopy (FESEM), and highresolution transmission electron microscopy (HRTEM). Besides, the electrical transport properties were measured at room temperature. The results show that high temperature and high pressure method is a simple and rapid route to synthesize bulk thermoelectric materials. The samples are composed of typical layered crystals with good crystallinity. The resistivity increases with the increase of synthetic pressure. A maximum power factor of 10.85 μW/(cm·K2) is obtained for the sample at 2 GPa.

Key words: high temperatureand high pressure, power factor, thermoelectric material, composite pressure