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

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

Research output: Contribution to journalArticle

1 Citation (Scopus)

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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Thermoelectric power
Thermal conductivity
Substitution reactions
Ions
Temperature
figure of merit
thermal conductivity
substitutes
solid state
electrical resistivity
synthesis
ions
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Low-temperature thermoelectric characteristics of Ca3-xYb xCo3.95Ga0.05O9+δ (0 ≤ × ≤ 0.10)",
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.",
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Low-temperature thermoelectric characteristics of Ca3-xYb xCo3.95Ga0.05O9+δ (0 ≤ × ≤ 0.10). / Bhaskar, Ankam; Huang, Y. C.; Liu, Chia-Jyi.

In: Journal of Materials Science: Materials in Electronics, Vol. 25, No. 1, 01.01.2014, p. 249-254.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Low-temperature thermoelectric characteristics of Ca3-xYb xCo3.95Ga0.05O9+δ (0 ≤ × ≤ 0.10)

AU - Bhaskar, Ankam

AU - Huang, Y. C.

AU - Liu, Chia-Jyi

PY - 2014/1/1

Y1 - 2014/1/1

N2 - 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.

AB - 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.

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