J. Mater. Sci. Technol. ›› 2014, Vol. 30 ›› Issue (8): 821-825.

• Orginal Article • Previous Articles     Next Articles

High Temperature Thermoelectric Properties of Dy-doped CaMnO3 Ceramics

Bin Zhan1, Jinle Lan1, Yaochun Liu2, Yuanhua Lin1, *, Yang Shen1, Cewen Nan1   

  1. 1 State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering,Tsinghua University, Beijing 100084, China; 2 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2013-05-22 Online:2014-05-20 Published:2014-09-30
  • Contact: * Corresponding author. Prof., Ph.D.; Tel.: t86 10 62773741; Fax: t8610 62771160; E-mail address: linyh@tsinghua.edu.cn (Y. Lin).

Abstract: Dy-doped CaMnO3 ceramics have been synthesized by co-precipitation method combined with the solid-state reaction. Phase composition and microstructure analysis indicate that high density and pure CaMnO3 phase can be achieved. The electric conductivity can be enhanced by Dy doping, and result in a slight increase of the thermal conductivity. The highest dimensionless figure of merit ZT of 0.15 has been obtained at 973 K for x=0.02 sample, which is about 4 times larger than that of the pure CaMnO3, which indicate that CaMnO3 can be a promising candidate for n-type thermoelectric material at high temperature.

Key words: CaMnO3, Thermoelectric properties, Thermal conductivity