Preparation and Thermoelectric Properties of Ca₃Co₄O₉ Ceramics with Parallel Sheet Shaped Pores

Abstract:

Ca₃Co₄O₉ powders were synthesized by a solid-state reaction method. Porous Ca₃Co₄O₉ ceramics with parallel sheet shaped pores were prepared by a template sacrifice method using epispastic polystyrend (EPS) hollow spheres as the templates. During compaction of the green body, the EPS hollow spheres change into EPS discs due to the pressing force. After sintering, the pores in the Ca₃Co₄O₉ ceramics are sheet shaped, well distributed and parallel to the pressing surface of compaction. The value of ZT merit of the porous Ca₃Co₄O₉ sample obtained with 10 wt% EPS spheres is 0.0489. It was found that the ZT merit value can be improved by changing the density of sample to achieve a high ratio of electrical conductivity to thermal conductivity.

• Periodical: Key Engineering Materials (Volume 544)
• Pages: 355-359
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.544.355
• Online since: March 2013
• Authors: H.D. Wang, Xu Dong Sun, Xue Yong Ding, Mu Zhang, Xiao Dong Li, Ji Guang Li, Di Huo, Shao Hong Liu
• Keywords: Ca₃Co₄O₉, Porous, Sheet Shaped Pores, Thermoelectric Property

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