Thermoelectric properties of Ca3-xEuxCo 3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10)

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

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Polycrystalline samples of Ca3-xEuxCo 3.95Ga0.05O9+δ (x = 0.00, 0.02 and 0.10) have been prepared by conventional solid-state synthesis and their thermoelectric properties measured at 25 K to 300 K. 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 and thermopower were simultaneously increased with increasing Eu3+ content. The total thermal conductivity decreased with increasing Eu3+ content. A maximum dimensionless figure of merit of 0.033 at 300 K was reached for Ca 2.9Eu0.1Co3.95Ga0.05O 9+δ, which is about 27 % higher than that of the undoped sample. These results suggest that the Eu is an effective doping element for improving the thermoelectric properties of Ca3Co 3.95Ga0.05O9+δ.

Original languageEnglish
Pages (from-to)194-198
Number of pages5
JournalJournal of Electroceramics
Volume31
Issue number1-2
DOIs
Publication statusPublished - 2013 Oct 1

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Thermoelectric power
Chemical elements
Thermal conductivity
Doping (additives)
figure of merit
thermal conductivity
solid state
Temperature
electrical resistivity
synthesis
temperature

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Bhaskar, Ankam ; Huang, Y. C. ; Liu, Chia Jyi. / Thermoelectric properties of Ca3-xEuxCo 3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10). In: Journal of Electroceramics. 2013 ; Vol. 31, No. 1-2. pp. 194-198.
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Thermoelectric properties of Ca3-xEuxCo 3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10). / Bhaskar, Ankam; Huang, Y. C.; Liu, Chia Jyi.

In: Journal of Electroceramics, Vol. 31, No. 1-2, 01.10.2013, p. 194-198.

Research output: Contribution to journalArticle

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T1 - Thermoelectric properties of Ca3-xEuxCo 3.95Ga0.05O9+δ (0 ≤ x ≤ 0.10)

AU - Bhaskar, Ankam

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AU - Liu, Chia Jyi

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N2 - Polycrystalline samples of Ca3-xEuxCo 3.95Ga0.05O9+δ (x = 0.00, 0.02 and 0.10) have been prepared by conventional solid-state synthesis and their thermoelectric properties measured at 25 K to 300 K. 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 and thermopower were simultaneously increased with increasing Eu3+ content. The total thermal conductivity decreased with increasing Eu3+ content. A maximum dimensionless figure of merit of 0.033 at 300 K was reached for Ca 2.9Eu0.1Co3.95Ga0.05O 9+δ, which is about 27 % higher than that of the undoped sample. These results suggest that the Eu is an effective doping element for improving the thermoelectric properties of Ca3Co 3.95Ga0.05O9+δ.

AB - Polycrystalline samples of Ca3-xEuxCo 3.95Ga0.05O9+δ (x = 0.00, 0.02 and 0.10) have been prepared by conventional solid-state synthesis and their thermoelectric properties measured at 25 K to 300 K. 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 and thermopower were simultaneously increased with increasing Eu3+ content. The total thermal conductivity decreased with increasing Eu3+ content. A maximum dimensionless figure of merit of 0.033 at 300 K was reached for Ca 2.9Eu0.1Co3.95Ga0.05O 9+δ, which is about 27 % higher than that of the undoped sample. These results suggest that the Eu is an effective doping element for improving the thermoelectric properties of Ca3Co 3.95Ga0.05O9+δ.

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