Effect of hydrogen annealing of ball-milled Bi0.5Sb1.5Te3 powders on thermoelectric properties
- Title
- Effect of hydrogen annealing of ball-milled Bi0.5Sb1.5Te3 powders on thermoelectric properties
- Author
- 유봉영
- Keywords
- Thermoelectric; Bi0.5Sb1.5Te3; Hydrogen annealing; Seebeck coefficient; Minority carrier
- Issue Date
- 2017-06
- Publisher
- ELSEVIER SCIENCE SA
- Citation
- JOURNAL OF ALLOYS AND COMPOUNDS, v. 706, Page. 576-583
- 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, which results in degradation of the thermoelectric properties. In this study, hydrogen annealing was carried out at different temperatures to remove the dissolved oxygen. The reduced oxygen content was confirmed after hydrogen annealing, and the extent of the reduction was increased with annealing temperature. The carrier (holes) concentration was increased with the reduction of the oxygen content, which is attributed to the increased concentration of the antisite defects. Consequently, the electrical conductivity was considerably increased whereas the Seebeck coefficient was marginally decreased. The variation of the Seebeck coefficient was interpreted with complex electronic structure. As a result, the power factor and ZT were enhanced 27.0% and 18.2%, respectively, compared with the non-annealed sample. (C) 2017 Elsevier B.V. All rights reserved.
- URI
- https://www.sciencedirect.com/science/article/pii/S0925838817306278https://repository.hanyang.ac.kr/handle/20.500.11754/72171
- ISSN
- 0925-8388; 1873-4669
- DOI
- 10.1016/j.jallcom.2017.02.181
- Appears in Collections:
- COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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