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Preparation and thermoelectric properties of highly oriented calcium cobalt oxides by solution combustion synthesis with post-spark plasma sintering

LIHUA ZHANG1,2,* , NORIYUKI OKINAKA3, TSUYOSHI TOSHO4, TOMOHIRO AKIYAMA3

Affiliation

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, P. R. China
  2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, P. R. China
  3. Center for Advanced Research of Energy Conversion Materials, Hokkaido University, Sapporo 060-8628, Japan
  4. Thermoelectric Device Development Inc., Noboribetsu 059-0003, Japan

Abstract

In this paper, layered cobalt oxides of Ca3Co4O9 and Bi-doped Ca3Co4O9 were synthesized by solution combustion synthesis with post-spark plasma sintering method, and the thermoelectric properties of the synthesized materials were analyzed from different directions. The synthesized bulk samples showed a relatively high orientation degree analyzed by XRD degree, and the Lotgering factor of Ca3Co4O9 and Bi-doped Ca3Co4O9 is 0.70 and 0.91 respectively. Thermoelectric properties measured from different directions show that the power factor and ZT value measured perpendicular to the press direction are relatively higher and the highest ZT value 0.11 was obtained by Bi-doped Ca3Co4O9 at 857 K..

Keywords

Thermoelectric properties, Solution combustion synthesis, Spark plasma sintering, Orientation degree.

Submitted at: Oct. 26, 2011
Accepted at: Feb. 20, 2012

Citation

LIHUA ZHANG, NORIYUKI OKINAKA, TSUYOSHI TOSHO, TOMOHIRO AKIYAMA, Preparation and thermoelectric properties of highly oriented calcium cobalt oxides by solution combustion synthesis with post-spark plasma sintering, Journal of Optoelectronics and Advanced Materials Vol. 14, Iss. 1-2, pp. 67-71 (2012)