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PUKYONG Repository 대학원 소재프로세스공학과

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Abstract: The present study focused on the synthesis of Bi-Te-Se-based powder by an oxide-reduction process, and the analysis of thermoelectric properties of the synthesized powder. The phase structure, chemical composition, and morphology of the synthesized powder were analyzed by XRD, EPMA and SEM. The synthesized powder was sintered by the spark plasma sintering. The thermoelectric properties of the sintered body were evaluated by measuring its Seebeck coefficient, electrical resistivity, and thermal conductivity. Bi2Te2.7Se0.3 powder was synthesized from a mixture of Bi2O3, TeO2, and SeO2 powders by mechanical milling, calcination, and reduction. The sintered body of the synthesized powder exhibited n-type thermoelectric characteristics. The thermoelectric properties of the sintered bodies depend on the reduction temperature. The Seebeck coefficient and electrical resistivity of the sintered body were increased with increasing reduction temperature. The sintered body of the Bi2Te2.7Se0.3 powder synthesized at 360℃ showed about 0.5 of the figure of merit (ZT) at room temperature.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/9022
http://pknu.dcollection.net/jsp/common/DcLoOrgPer.jsp?sItemId=000001965875

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 6
2.2 열전성능의 최적화 9
2.3 Bi-Te계 열전재료 12
2.3.1 Bi2Te3계 결정구조 12
2.3.2 Anti-site defect 15
2.3.3 제조방법 17
3. 실험방법 19
3.1 Bi2Te2.7Se0.3 열전분말 합성 19
3.2 Bi2Te2.7Se0.3 열전분말 소결 20
3.3 Bi2Te2.7Se0.3 열전분말 소결체의 특성평가 20
4. 결과 및 고찰 23
4.1 Bi2Te2.7Se0.3 열전분말 합성 23
4.1.1 Bi2Te2.7Se0.3 상 형성에 미치는 기계적 밀링의 영향 23
4.1.2 Bi2Te2.7Se0.3 상 형성에 미치는 복산화물 형성의 영향 27
4.1.3 Bi2Te2.7Se0.3 상 형성에 미치는 환원온도의 영향 31
4.2 Bi2Te2.7Se0.3 열전분말 소결체의 열전특성에 미치는 환원온도의 영향 34
4.2.1 환원온도에 따른 전기적 특성의 변화 34
4.2.2 환원온도에 따른 열전도도의 변화 40
4.2.3 환원온도에 따른 성능지수의 변화 42
5. 결론 44
6. 참고문헌 44

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