Abstract
Bismuth telluride (<TEX>$Bi_2Te_3$</TEX>) and its alloys are well-known thermoelectric materials for ambient temperature applications. In this study, the dissolved Bi-Te precursor solution was used to synthesis metallic <TEX>$Bi_2Te_3$</TEX> powder via ultrasonic spray pyrolysis and reduction process. The droplets of the Bi-Te precursor solution were decomposed to Bi-Te oxide powders by ultrasonic spray pyrolysis. The spherical <TEX>$Bi_2Te_3$</TEX> powders were synthesized by reduction reaction in atmosphere of hydrogen gas at the temperature above <TEX>$375^{\circ}C$</TEX> for 6h. The reduced <TEX>$Bi_2Te_3$</TEX> powders have a mean particle size of <TEX>$1.5{\mu}m$</TEX>. The crystal structure of the powder was evaluated by X-Ray diffraction(XRD), and the microstructure with size and shape powders was observed by fieldemission scanning electron microscope(FE-SEM) and transmission electron microscope(TEM).
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