Synthesis and Thermoelectric Properties of Nano Ca_2.6Bi_0.4Co₄O₉ Ceramics

Abstract:

Pure Ca_2.6Bi_0.4Co₄O₉ Ceramic compound were successfully prepared by adopting a facile solution combustion synthesis method. The crystallinity, morphology were characterized by XRD, FE-SEM. The thermoelectric properties of Bi-doped Ca₃Co₄O₉ were also systematically investigated. The results indicate the prepared samples are p-type semiconductors. Both the electrical conductivity and the Seebeck coefficient increase with the increasing of temperatures. Bi substitutions at Ca site enhanced carrier mobility and resulted in a marked increase in thermoelectric properties. The power factor of as-prepared Ca_2.6Bi_0.4Co₄O₉ sample can reach 2.67×10^-4W/mK² at 1000 K. The synthesized Ca_2.6Bi_0.4Co₄O₉ ceramic materials have potential application for high-temperature thermoelectric energy conversion.

• Periodical: Applied Mechanics and Materials (Volume 327)
• Pages: 108-111
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.327.108
• Online since: June 2013
• Authors: Zhe Chen, Li Qiang Zhang, Zhi Ying Zhao, Miao Miao Wang, Zhen Hui Shan, Jun Hong Zhang
• Keywords: Ceramic, Cobalt Oxide, Microstructure, Substitution, Thermoelectric Properties

References

[1] Hiromichi Ohta, Kenji Sugiura and Kunihito Koumoto.Inorg. Chem. 2008, 47, 8429

[2] H. Ohta, S. Kim, Y. Mune, T. Mizoguchi, et al. Nature Mater., 2007, (6):129

[3] Vaqueiro, P. and Powell, A.V. Journal of Materials Chemistry, 2010, 20(43):9577

[4] I. Terasaki, Y. Sasago, K. Uchinokura. Phys. Rev. B , 1997, (56):12685

[5] S. Li, R. Funahashi, I. Matsubara, et al. J. Mater. Sci. Lett. 2000, (19):1339

[6] L.C. Moreno，D. Cadavid J.E. Rodriguez.Microelectronics Journal, 2008, (39) :548

[7] Y. Wang, S. Nyrissa, and R. J. Cava et al. Nature, 2003, 423, 425

[8] R. Simon. J. Appl. Phys. 33, 1962,1830