Anisotropy of the thermoelectric figure of merit (ZT) in textured Ca3Co4O9 ceramics prepared by using a spark plasma sintering process

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• 作者：Chang-Hyun Lim (1) (2)
  Won-Seon Seo (1)
  Soonil Lee (1)
  Young Soo Lim (1)
  Jong-Young Kim (1)
  Hyung-Ho Park (2)
  Soon-Mok Choi (3)
  Kyu Hyoung Lee (4)
  Kyeongsoon Park (5)
  
  1. Energy & Environmental Division ; Korea Institute of Ceramic Engineering and Technology ; Seoul ; 153-801 ; Korea
  2. Department of Materials Science and Engineering ; Yonsei University ; Seoul ; 120-749 ; Korea
  3. School of Energy ; Materials and Chemical Engineering ; Korea University of Technology and Education ; Cheonan ; 330-708 ; Korea
  4. Department of Nano Applied Engineering ; Kangwon National University ; Chuncheon ; 200-701 ; Korea
  5. Department of Advanced Materials Engineering ; Sejong University ; Seoul ; 143-747 ; Korea
  
• 关键词：Ca3Co4O9 ; Thermoelectric anisotropy ; Spark plasma sintering ; Thermal property ; Lotgering factor
• 刊名：Journal of the Korean Physical Society
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：66
• 期：5
• 页码：794-799
• 全文大小：1,578 KB
• 参考文献：1. Yakabe, H., Kikuchi, K., Terasaki, T. (1997) Proceeding of the 16th International Conference on Thermoelectrics.
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• 刊物主题：Physics, general; Theoretical, Mathematical and Computational Physics; Particle and Nuclear Physics;
• 出版者：Springer Netherlands
• ISSN：1976-8524

文摘

Textured Ca3Co4O9 ceramics were prepared by spark plasma sintering (SPS) from commercial CaCO3 and Co3O4 powders to investigate the thermoelectric anisotropy of Ca3Co4O9. The degree of orientation of the textured specimens was evaluated by using the Lotgering factor method, and the SPS process was confirmed to be an effective technology to prepare textured Ca3Co4O9 ceramics. Both the power factors and the thermal conductivities were measured in two different directions, parallel (out-of-plane) and perpendicular (in-plane) to the SPS press axis. The difference in anisotropy between the electrical conductivity and the thermal conductivity was investigated for the textured Ca3Co4O9 ceramics. The maximum figure of merit (ZT) value along the direction perpendicular to the SPS press axis was more than 20% higher than it was along the direction parallel to the SPS press axis. It is noted that the strong thermoelectric anisotropy can give rise to an overestimates of ZT when preparing samples in different directions for power factor and thermal conductivity measurements.