| 학회 | 한국재료학회 |
| 학술대회 | 2006년 가을 (11/03 ~ 11/03, 수원대학교) |
| 권호 | 12권 2호 |
| 발표분야 | 에너지 환경재료 |
| 제목 | Synthesis and Thermoelectric Properties of InzCo4Sb12 |
| 초록 | Filled skutterudite has a general form RM4X12 where R represents the filler atom, so-called the rattler (La, Ce, Sn, Ca, Ba, etc.), M represents the transition metal atom (Co, Rh, Ir) and X represents the pnicogen atom (P, As, Sb). The R, M and X atoms occupy the 2a positions (0, 0, 0), the 8c positions (¼. ¼, ¼) and the 24g positions (0, y, z), respectively. Many researchers have tried to fill the voids with rattlers and/or to dope with suitable impurities to reduce thermal conductivity by introducing phonon scattering centers. Up to now, in the filled skutterudites the highest ZT has been achieved by n-type BayCo4-xNixSb12 with ZT = 1.25 at 900 K [1] and p-type (La/Ce)yCo4-xFexSb12 with ZT = 1.4 at 1000 K [2]. In this study, In-filled CoSb3 skutterudites (InzCo4Sb12: 0≤z≤0.3) were successfully synthesized by the encapsulated induction melting process. High purity elemental materials of Co, Sb and In were taken in an evacuated quartz ampoule and melted in an RF electrical power of 7kW/40kHz for one hour. The ingots were annealed at 823 K for 144 hours to avoid the secondary phase formation and to give sufficient time for In to fill the void in the skutterudite structure. Seebeck coefficient confirmed that all the In-filled samples are n-type conducting. The temperature dependence of electrical resistivity suggests that InzCo4Sb12 is a highly degenerate semiconducting material. The lowest thermal conductivity was achieved by In0.25Co4Sb12. The maximum ZT of 1.1 at 700K has been achieved when the In filling fraction is 0.25. Acknowledgments: This work was supported by the Regional Innovation Center (RIC) Program conducted by the Ministry of Commerce, Industry and Energy of Korean Government. [1] X. Tang, L.M. Zhang, R.Z. Yuan, L.D. Chen, T. Goto, T. Hirai, J.S. Dyck, W. Chen, C. Uher, J. Mater. Res., 16 (2001) 3343. [2] B.C. Sales, D. Mandrus, R.K Williams, Science 272 (1996) 1325. |
| 저자 | Jae-Yong Jung1, Soon-Chul Ur2, Il-Ho Kim1 |
| 소속 | 1Department of Materials Science and Engineering/ReSEM, 2Chungju National Univ. |
| 키워드 | Thermoelectric; Skutterudite |
