High-temperature thermoelectric properties of Ca3-xPr xCo3.95Ga0.05O9+δ

Ankam Bhaskar, C. S. Jhang, Chia Jyi Liu, Huey Lin Hsieh, Jing Yi Huang

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2 Citations (Scopus)


Ca3Co4O9+δ and Ca 3-xPrxCo3.95Ga0.05O 9+δ (x = 0.02, 0.05 and 0.10) samples were prepared by conventional solid-state synthesis. The thermoelectric (TE) properties were measured at 300-750 K. The XRD patterns revealed that all the samples are single phase. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The power factor of Ca2.9Pr0.10Co3.95Ga 0.05O9+δ was improved about 52.6 % compared to Ca3Co4O9+δ at 300 K. Ca 2.9Pr0.10Co3.95Ga0.05O 9+δ had the highest dimensionless figure of merit of 0.030 at 300 K, representing an improvement of about 50 % compared to Ca 3Co4O9+δ. These results indicate that partial substitution of Pr3+ ion improves the TE properties of Ca3Co4O9+δ.

Original languageEnglish
Pages (from-to)4857-4861
Number of pages5
JournalJournal of Materials Science: Materials in Electronics
Issue number12
Publication statusPublished - 2013 Dec 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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