Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ

Chia Jyi Liu, Wei Cheng Wang, J. J. Yuan, Jeng Lung Chen, Mei Huei Wu, Ching Lin Chang

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1-x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO 3-δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d-O 2p hybridization increases considerably, and unoccupied (3d-4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d-O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.

Original languageEnglish
Pages (from-to)2094-2098
Number of pages5
JournalJournal of Electronic Materials
Volume43
Issue number6
DOIs
Publication statusPublished - 2014

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Thermoelectric power
Electronic structure
Substitution reactions
electronic structure
X rays
Transport properties
x ray absorption
electrical resistivity
substitutes
Temperature
transport properties
temperature dependence

All Science Journal Classification (ASJC) codes

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

Cite this

Liu, Chia Jyi ; Wang, Wei Cheng ; Yuan, J. J. ; Chen, Jeng Lung ; Wu, Mei Huei ; Chang, Ching Lin. / Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ. In: Journal of Electronic Materials. 2014 ; Vol. 43, No. 6. pp. 2094-2098.
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abstract = "We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1-x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO 3-δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d-O 2p hybridization increases considerably, and unoccupied (3d-4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d-O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.",
author = "Liu, {Chia Jyi} and Wang, {Wei Cheng} and Yuan, {J. J.} and Chen, {Jeng Lung} and Wu, {Mei Huei} and Chang, {Ching Lin}",
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Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ. / Liu, Chia Jyi; Wang, Wei Cheng; Yuan, J. J.; Chen, Jeng Lung; Wu, Mei Huei; Chang, Ching Lin.

In: Journal of Electronic Materials, Vol. 43, No. 6, 2014, p. 2094-2098.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Correlation between the electronic structure and the thermoelectric properties of Gd-doped CaMnO3-δ

AU - Liu, Chia Jyi

AU - Wang, Wei Cheng

AU - Yuan, J. J.

AU - Chen, Jeng Lung

AU - Wu, Mei Huei

AU - Chang, Ching Lin

PY - 2014

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N2 - We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1-x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO 3-δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d-O 2p hybridization increases considerably, and unoccupied (3d-4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d-O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.

AB - We report x-ray absorption near edge structure (XANES) on bulk samples of Ca1-x Gd x MnO3+δ with x = 0, 0.02, and 0.05. The transport properties measurements indicate that both resistivity and the absolute value of thermopower decrease with increasing x. Meanwhile, the temperature dependence of resistivity changes from non-metallic CaMnO 3-δ to metallic for samples of x = 0.02 and 0.05. XANES spectra at the O K-edge, Mn L 2,3-edge, and Ca L 2,3-edge indicate that Mn 3d-O 2p hybridization increases considerably, and unoccupied (3d-4s) states of Ca decrease with increasing substitution content. The increases of Mn 3d-O 2p hybridization might be responsible for the decrease of the resistivity and the absolute value of thermopower upon partial Gd substitution for Ca.

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