Improvements of thermoelectric transport properties for a partially substituted Ca3Co4O9 system by spark plasma sintering
연계정보
원문
외부기관 원문
초록보기
Highly-dense and textured Ca3Co4O9 ceramic samples were obtained by a spark plasma sintering (SPS) process. The sintering conditions were modified to optimize the degree of orientation and the bulk densities which are important for their thermoelectric performance. Their thermoelectric properties were measured from room temperature to 1,180 K in air. The maximum power factor was achieved at 1,153 K in the SPS-sintered case because of the maximum electrical conductivity owing to both the degree of orientation and bulk density. In order to improve the thermoelectric performance of this SPS-sintered Ca3Co4O9 system a doping effect with various dopants was also investigated. Ca3Co4O9 samples doped with Ag, Bi, and Na were prepared. Three factors including acceptor doping, a grain boundary phase and elevated mobility caused enhanced electrical conductivities. And these increased electrical conductivities resulted in increased power factors.
H. Yakabe, K. Kikuchi and T. Terasaki, in Proceedings of the 16th International Conference on Thermoelectrics, August 1997, edited by A. Heinrich (IEEE, 1997) p. 523.
미소장
2
Y. Miyazaki, Solid State Ionics 172 (2004) 463-467.
미소장
3
Y. Masuda, D. Nagahama, H. Itahara, T. Tani, W.S. Seo and K. Koumoto, J. Mater. Chem. 13 (2003) 1094-1099.
미소장
4
Y. Song, Q. Suna, L. Zhaoa, F. Wanga and Z. Jianga, Mater. Chem. Phys. 113 (2009) 645-649.
미소장
5
Y. Liu, Y. Lin, L. Jiang, C.W. Nan and Z. Shen, J. Electroceram. 21 (2008) 748-751.
미소장
6
Y.H. Lin, C.W. Nan, Y. Liu and J. Li, J. Am. Ceram. Soc.90 (2007) 132-136.
미소장
7
T. Takeuchi, T. Kondo, K. Soda, U. Mizutani, R. Funahashi, M. Shikano, S. Tsuda, T. Yokoya, S. Shin and T. Muro, J. Electron. Spectrosc. Relat. Phenom. 137 (2004) 595-599.
미소장
8
R. Koc and H.U. Anderson, J. Mat. Sci. 27 (1992) 5477-5482.
미소장
9
E.J. Verwey, P.W. Haaijam, F.C. Romeijh and G.W. Van Oosterhout, Phillips Res. Rep. 5 (1950) 173.
미소장
10
H. Itahara, J. Sugiyama and T. Tani, Jpn. J. Appl. Phys. 43(2004) 5134-5139.
미소장
11
Y. Wang, Y. Sui, J. Cheng, X. Wang, J. Miao, Z. Liu, Z. Qian and W. Su, J. Alloy. Compd. 448 (2008) 1-5.
미소장
12
G. Xu, R. Funahashi, M. Shikano, I. Matsubara and Y. Zhou, Appl. Phys. Lett. 80 (2002) 3760-3762.
미소장
13
D. Flahaut, T. Mihara R. Funahashi, N. Nabeshima, K. Lee, H. Ohta and K. Koumoto, J. Appl. Phys. 100 (2006) 084911-1-4.