방전플라즈마 소결공정 변수에 따른 Bi0.5Sb1.5Te3의 전기적 특성 변화
- Abstract
- The study investigated the change of electrical properties of Bi0.5Sb1.5Te3 with spark plasma sintering parameters. The Bi0.5Sb1.5Te3 powders were prepared by mechanical milling process. The mechanical treated powders were sintered by using spark plasma sintering process under various sintering conditions. The anisotropy of crystal structure, grain size, lattice strain in the Bi0.5Sb1.5Te3 sintered body were analyzed by XRD. Electrical properties of the Bi0.5Sb1.5Te3 sintered body was evaluated by measuring Seebeck coefficient and electrical resistivity using four-point probe. The carrier behavior was analyzed by Hall measurement. Anisotropy of crystal structure of Bi0.5Sb1.5Te3 sintered body was increased as sintering pressure on pulse current, and DC decreased. Grain size of sintered body was decreased as sintering pressure on pulse current, and DC increased. The Seebeck coefficient and electrical resistivity of the Bi0.5Sb1.5Te3 sintered body were increased with increasing sintering pressure, regardless of the current type(pulse, DC). Increasing of the Seebeck coefficient and electrical resistivity was due to decreased carrier concentration.
- Issued Date
- 2015
- Awarded Date
- 2015. 2
- Type
- Dissertation
- Publisher
- 부경대학교
- Affiliation
- 신소재시스템공학과
- Department
- 대학원 신소재시스템공학과
- Advisor
- 이길근
- Table Of Contents
- 1. 서론‧ 1
2. 이론적 배경 ‧ 3
2.1 열전현상‧ 3
2.1.1 Seebeck 효과‧ 3
2.1.2 Peltier 효과 ‧ 7
2.2 열전성능의 최적화 ‧ 11
2.3 Bi-Te계 열전재료 ‧ 14
2.3.1 Bi2Te3 열전재료‧ 14
2.3.2 Anti-site defect‧ 17
2.3.3 제조방법‧ 21
2.4 방전플라즈마 소결법‧ 22
2.5 전류방식의 종류 및 차이점‧ 25
3. 실험방법‧ 30
3.1 Bi0.5Sb1.5Te3 열전분말의 소결‧ 30
3.2 Bi0.5Sb1.5Te3 소결체의 특성평가 ‧ 33
3.2.1 Bi0.5Sb1.5Te3 소결체의 미세조직‧ 33
3.2.2 Bi0.5Sb1.5Te3 소결체의 전기적 특성‧ 36
4. 결과 및 고찰‧ 37
4.1 소결압력에 따른 Bi0.5Sb1.5Te3 소결체의 미세조직 변화‧ 37
4.1.1 Pulse 전류방식에서의 미세조직 변화‧ 37
4.1.2 DC 전류방식에서의 미세조직 변화‧ 44
4.2 소결압력에 따른 Bi0.5Sb1.5Te3 소결체의 전기적 특성 변화‧ 51
4.2.1 Pulse 전류방식에서의 전기적 특성 변화‧ 51
4.2.2 DC 전류방식에서의 전기적 특성 변화‧ 57
5. 결론 ‧ 62
6. 참고문헌 ‧ 63
- Degree
- Master
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