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 language | English |
|---|---|
| Pages (from-to) | 2094-2098 |
| Number of pages | 5 |
| Journal | Journal of Electronic Materials |
| Volume | 43 |
| Issue number | 6 |
| DOIs | |
| Publication status | Published - 2014 |
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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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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 journal › Article
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
Y1 - 2014
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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U2 - 10.1007/s11664-013-2969-1
DO - 10.1007/s11664-013-2969-1
M3 - Article
AN - SCOPUS:84901930641
VL - 43
SP - 2094
EP - 2098
JO - Journal of Electronic Materials
JF - Journal of Electronic Materials
SN - 0361-5235
IS - 6
ER -