논문 해외 국제전문학술지(SCI급) A HYBRID METHOD FOR THE SYNTHESIS OF SMALL BI0.5SB1.5TE3 ALLOY PARTICLES
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2017-03
- 저자명 오민욱
- 학술지명 JOURNAL OF ALLOYS AND COMPOUNDS
- 발행처명 ELSEVIER SCIENCE SA
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
A reduction in the grain size of p-type thermoelectric materials, which increases phonon scattering at grain boundaries, can increase the figure of merit (ZT) due to decreased lattice thermal conductivit y. Small grains are often observed in samples sintered from small po wders. In this study, we investigated the effect of a reduction in powde r size in Bi0.5Sb1.5Te3 alloys synthesized using a new hybrid method. Tellurium (Te) nanowires were chemically synthesized without a n organic surfactant and Bi0.25Sb0.75 powders were physically synthesize d using a ball-milling method. The Bi0.5Sb1.5Te3 powders synthesized fro m the previously prepared Te nanowires and Bi0.25Sb0.75 powder were thermally alloyed by a solid state reaction. The morphology of the Te w as found to be important in determining the powder size of the alloyed Bi0.5Sb1.5Te3. Reduced thermal conductivity was associated wi th smaller grain size, which enhanced thermoelectric properties. (C) 201 6 Elsevier B. V. All rights reserved.