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Alternative Title: Synthesis of Cu-Se system thermoelectric powder by the oxide-reduction process and electrical properties

Abstract: In this study, we studied the synthesis of the Cu-Se system thermoelectric powders by the oxide-reduction process and electrical properties. Through XRD analysis, it was confirmed that the powder was successfully synthesized in the Cu-Se system and powder pre-treatment was important in synthesis. The synthesized powder was sintered by the Hot press. The electrical properties of the sintered body were evaluated by Seebeck coefficient and electrical conductivity with ZEM-3 equipment. The sintered bodies showed p-type thermoelectric properties. Since sintering was perfomed at a high temperature, there was concern about the volatility of Se. So we analyzed the exact composition with EPMA equipment. In the Cu-Se system sintered bodies, the Seebeck coefficient increased and the electrical conductivity decreased with increasing Cu composition. This would be considered due to the decrease of the carrier concentration. The Cu2.11Se sintered body had the optimum carrier concentration (12.80×1019cm-3) and the highest power factor (0.57×10-3W/mK2) at room temperature.

URI: https://repository.pknu.ac.kr:8443/handle/2021.oak/23301
http://pknu.dcollection.net/common/orgView/200000177769

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 5
2.2 열전특성의 최적화 7
2.2.1 성능지수(ZT) 7
2.2.2 Seebeck 계수 8
2.2.3 전기전도도 11
2.2.4 열전도도 14
2.3 Cu-Se계 열전재료 16
2.3.1 Cu-Se계 열전재료의 결정구조 16
2.3.2 Cu-Se계 열전재료의 특성향상 방향 21
3. 실험방법 23
3.1 Cu-Se계 열전분말의 합성 및 소결 23
3.2 Cu-Se계 소결체의 특성평가 24
4. 결과 및 고찰 26
4.1 Cu-Se계 분말 합성 공정기술 확립 26
4.1.1 밀링이 Cu-Se계 열전분말 형성에 미치는 영향 26
4.1.2 Cu-Se계 열전분말 형성에 미치는 합성 온도 영향 33
4.2 Cu-Se계 Cu 조성 변화 실험 35
4.2.1 Cu-Se계 조성에 따른 열전분말 합성 35
4.2.2 Cu-Se계 소결체의 결정구조 및 미세조직 36
4.2.3 Cu-Se계 소결체의 전하 거동 43
4.2.4 Cu-Se계 소결체의 전기적 특성 평가 46
5. 결론 54
6. 참고문헌 55

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