논문 해외 국제전문학술지(SCI급) EFFECT OF HYDROGEN ANNEALING OF BALL-MILLED BI0.5SB1.5TE3 POWDERS ON THERMOELECTRIC PROPERTIES
- 학술지 구분 국제전문학술지(SCI급)
- 게재년월 2017-06
- 저자명 오민욱
- 학술지명 JOURNAL OF ALLOYS AND COMPOUNDS
- 발행처명 ELSEVIER SCIENCE SA
- 발행국가 해외
- 논문언어 외국어
- 전체저자수 4
홈페이지논문 초록 (Abstract)
The combination technique of ball-milling and sintering is commonly employed to manufacture high performance thermoelectric materials. However, during ball-milling and sintering, it is hard to avoid inclusion of oxygen in the lattice, whichresults in degradatio n of the thermoelectric properties. In this study, hydrogen annealing wa s carried out at different temperatures to remove the dissolved o xygen. The reduced oxygen content was confirmed after hydrogen anneali ng, and the extent of the reduction was increased with annealing temper ature. The carrier (holes) concentration was increased with the reduct ion of the oxygen content, which is attributed to the increased concen tration of the antisite defects. Consequently, the electrical conductiv ity was considerably increased whereas the Seebeck coefficient was marg inally decreased. The variation of the Seebeck coefficient was interpr eted with complex electronic structure. As a result, the power facto r and ZT were enhanced 27.0%and 18.2%, respectively, compared with the non-annealed sample. (C) 2017 Elsevier B.V. All rights reserve d.