Low-temperature thermoelectric characteristics of Ca3-xYb xCo3.95Ga0.05O9+δ (0 ≤ × ≤ 0.10)

Ankam Bhaskar, Y. C. Huang, Chia Jyi Liu

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Abstract

Polycrystalline samples of Ca3-xYbxCo 3.95Ga0.05 O9+5 (x - 0.00, 0.02, 0.05 and 0.10) have been prepared by conventional solid-state synthesis. The XRD results 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 electrical resistivity, thermopower increased and total thermal conductivity decreased with increasing Yb3+ content. Ca2.95Yb0.05Co3.95Ga 0.05O9+δ had the highest dimensionless figure of merit of 0.035 at 300 K, which is about 34.6 % higher than that of the undoped sample. These results suggested that the partial substitution of Yb3+ ion improves the thermoelectric properties of Ca3Co 4O9+δ.

Original languageEnglish
Pages (from-to)249-254
Number of pages6
JournalJournal of Materials Science: Materials in Electronics
Volume25
Issue number1
DOIs
Publication statusPublished - 2014 Jan 1

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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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