Thermoelectric properties of Ca3-x Dyx Co 3.95Ga0.05O9+δ

Ankam Bhaskar, C. S. Jhang, Chia-Jyi Liu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ca3Co4O9+δ and Ca3-x Dyx Co3.95Ga0.05O9+δ (x = 0.05, 0.10) samples were prepared by conventional solid-state synthesis, and their thermoelectric properties measured at 25 K to 300 K. The x-ray diffraction 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 highest power factor among all the samples (2.45 μW cm-1 K-2 at 132 K) was obtained for Ca2.9Dy0.1Co3.95Ga0.05O 9+δ, being about 80% higher than that of the undoped sample. Ca2.9Dy0.1Co3.95 Ga0.05O 9+δ had the highest dimensionless figure of merit of 0.033 at 300 K, representing an improvement of about 74% compared with undoped Ca 3Co4O9+δ .

Original languageEnglish
Pages (from-to)3541-3546
Number of pages6
JournalJournal of Electronic Materials
Volume42
Issue number12
DOIs
Publication statusPublished - 2013 Dec 1

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Thermoelectric power
Diffraction patterns
X rays
Temperature
figure of merit
x ray diffraction
diffraction patterns
solid state
synthesis
temperature

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Materials Chemistry

Cite this

Bhaskar, Ankam ; Jhang, C. S. ; Liu, Chia-Jyi. / Thermoelectric properties of Ca3-x Dyx Co 3.95Ga0.05O9+δ. In: Journal of Electronic Materials. 2013 ; Vol. 42, No. 12. pp. 3541-3546.
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abstract = "Ca3Co4O9+δ and Ca3-x Dyx Co3.95Ga0.05O9+δ (x = 0.05, 0.10) samples were prepared by conventional solid-state synthesis, and their thermoelectric properties measured at 25 K to 300 K. The x-ray diffraction 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 highest power factor among all the samples (2.45 μW cm-1 K-2 at 132 K) was obtained for Ca2.9Dy0.1Co3.95Ga0.05O 9+δ, being about 80{\%} higher than that of the undoped sample. Ca2.9Dy0.1Co3.95 Ga0.05O 9+δ had the highest dimensionless figure of merit of 0.033 at 300 K, representing an improvement of about 74{\%} compared with undoped Ca 3Co4O9+δ .",
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Thermoelectric properties of Ca3-x Dyx Co 3.95Ga0.05O9+δ. / Bhaskar, Ankam; Jhang, C. S.; Liu, Chia-Jyi.

In: Journal of Electronic Materials, Vol. 42, No. 12, 01.12.2013, p. 3541-3546.

Research output: Contribution to journalArticle

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AB - Ca3Co4O9+δ and Ca3-x Dyx Co3.95Ga0.05O9+δ (x = 0.05, 0.10) samples were prepared by conventional solid-state synthesis, and their thermoelectric properties measured at 25 K to 300 K. The x-ray diffraction 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 highest power factor among all the samples (2.45 μW cm-1 K-2 at 132 K) was obtained for Ca2.9Dy0.1Co3.95Ga0.05O 9+δ, being about 80% higher than that of the undoped sample. Ca2.9Dy0.1Co3.95 Ga0.05O 9+δ had the highest dimensionless figure of merit of 0.033 at 300 K, representing an improvement of about 74% compared with undoped Ca 3Co4O9+δ .

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