Thermoelectric properties of Ca3-xDyx Co 4O9+δ with x=0.00, 0.02, 0.05, and 0.10

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

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Polycrystalline samples of Ca3-x Dy x Co 4O9+δ (x = 0.00, 0.02, 0.05, and 0.10) have been prepared by conventional solid-state synthesis. The x-ray diffraction (XRD) results revealed that all the samples are single phase. The thermoelectric properties were measured at 25 K to 300 K. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity of all the samples exhibited the nonmetal-to-metal transition at below 75 K. The electrical resistivity decreased and the thermopower increased with increasing Dy3+ content. Among all the samples, Ca2.9Dy0.10Co4O 9+δ had the highest dimensionless figure of merit of 0.044 at 300 K.

Original languageEnglish
Pages (from-to)2582-2586
Number of pages5
JournalJournal of Electronic Materials
Volume42
Issue number8
DOIs
Publication statusPublished - 2013 Aug 1

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Thermoelectric power
Nonmetals
Transition metals
Diffraction
X rays
electrical resistivity
figure of merit
x ray diffraction
Temperature
transition metals
solid state
synthesis
temperature

All Science Journal Classification (ASJC) codes

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

Cite this

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title = "Thermoelectric properties of Ca3-xDyx Co 4O9+δ with x=0.00, 0.02, 0.05, and 0.10",
abstract = "Polycrystalline samples of Ca3-x Dy x Co 4O9+δ (x = 0.00, 0.02, 0.05, and 0.10) have been prepared by conventional solid-state synthesis. The x-ray diffraction (XRD) results revealed that all the samples are single phase. The thermoelectric properties were measured at 25 K to 300 K. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity of all the samples exhibited the nonmetal-to-metal transition at below 75 K. The electrical resistivity decreased and the thermopower increased with increasing Dy3+ content. Among all the samples, Ca2.9Dy0.10Co4O 9+δ had the highest dimensionless figure of merit of 0.044 at 300 K.",
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Thermoelectric properties of Ca3-xDyx Co 4O9+δ with x=0.00, 0.02, 0.05, and 0.10. / Bhaskar, Ankam; Jhang, C. S.; Liu, Chia Jyi.

In: Journal of Electronic Materials, Vol. 42, No. 8, 01.08.2013, p. 2582-2586.

Research output: Contribution to journalArticle

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T1 - Thermoelectric properties of Ca3-xDyx Co 4O9+δ with x=0.00, 0.02, 0.05, and 0.10

AU - Bhaskar, Ankam

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AB - Polycrystalline samples of Ca3-x Dy x Co 4O9+δ (x = 0.00, 0.02, 0.05, and 0.10) have been prepared by conventional solid-state synthesis. The x-ray diffraction (XRD) results revealed that all the samples are single phase. The thermoelectric properties were measured at 25 K to 300 K. The thermopower of all the samples was positive, indicating that the predominant carriers are holes over the entire temperature range. The electrical resistivity of all the samples exhibited the nonmetal-to-metal transition at below 75 K. The electrical resistivity decreased and the thermopower increased with increasing Dy3+ content. Among all the samples, Ca2.9Dy0.10Co4O 9+δ had the highest dimensionless figure of merit of 0.044 at 300 K.

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