Journal of the Korean institute of surface engineering (한국표면공학회지)

The Korean Institute of Surface Engineering (한국표면공학회)
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Spherical Bi2Te3 Powder Synthesized by Oxide-Reduction Process via Ultrasonic Spray Pyrolysis

초음파 분무 열분해법에 의한 산화물 환원 공정의 구형 Bi2Te3 분말 합성

  • Song, Chul-Han (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Jang, Dae-Hwan (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Jin, Yun-Ho (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE)) ;
  • Kong, Man-Sik (Advanced Materials & Processing Center, Institute for Advanced Engineering (IAE))
  • 송철한 (고등기술연구원 신소재공정센터) ;
  • 장대환 (고등기술연구원 신소재공정센터) ;
  • 진연호 (고등기술연구원 신소재공정센터) ;
  • 공만식 (고등기술연구원 신소재공정센터)
  • Received : 2017.04.14
  • Accepted : 2017.04.26
  • Published : 2017.04.30
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Abstract

Bismuth telluride ($Bi_2Te_3$) 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 $Bi_2Te_3$ 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 $Bi_2Te_3$ powders were synthesized by reduction reaction in atmosphere of hydrogen gas at the temperature above $375^{\circ}C$ for 6h. The reduced $Bi_2Te_3$ powders have a mean particle size of $1.5{\mu}m$. 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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