Articles
  • Thermoelectric properties of perovskite-type rare earth cobalt oxide solid solutions Pr1−xDyxCoO3
  • Hideki Hashimotoa,b, Takafumi Kusunosec and Tohru Sekinob,*
  • a The Institute of Scientific and Industrial Research, Osaka University, 8-1 Mihogaoka, Ibraki, Osaka 567-0047, Japan b Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan c Department of Advanced Materials Science, Faculty of Engineering, Kagawa University, 2217-20 Hayashi-cho, Takamatsu, 761-0396, Japan
Abstract
Perovskite-type rare earth cobalt oxide Pr1−xDyxCoO3 (x = 0, 0.25, 0.5, 0.75 and 1) ceramics were fabricated by reaction sintering of the corresponding metal oxide powders, and their thermoelectric properties were evaluated up to 873 K. The electrical properties of Pr1−xDyxCoO3 varied according to a variation in the x value, whereas the thermal conductivity of the solid solutions (x = 0.25 − 0.75) tends to be lower than that of both end components (x = 0 and 1). As the results, Pr0.75Dy0.25CoO3 (x = 0.25) showed the highest figure of merit, Z = 5.72 × 10−5 K−1 at 773 K in the present Pr1−xDyxCoO3 system. This is considered due mainly to the effect of decreasing thermal conductivity caused by phonon scattering of partially substituted A-site ions. These results suggest that the fabrication of solid solutions is effective in improving the thermoelectric properties of the RCoO3 system.

Keywords: Thermoelectric properties, Perovskite, Rare earth cobalt oxides, Solid solutions, Phonon scattering

This Article

  • 2011; 12(3): 223-227

    Published on Jun 30, 2011

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