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https://nagoya.repo.nii.ac.jp/oai
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2023-01-16T03:56:42Z
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High-temperature thermoelectric properties of Ca0.9−xSrxYb0.1MnO3−delta (0<=x<=0.2)
Kosuga, Atsuko
Isse, Yuri
Wang, Yifeng
Koumoto, Kunihito
Funahashi, Ryoji
open access
Copyright (2009) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior per mission of the author and the American Institute of Physics.
calcium compounds
crystal structure
electrical conductivity
electrical resistivity
Seebeck effect
strontium compounds
thermal conductivity
thermoelectric power
ytterbium compounds
Polycrystalline samples of Ca0.9.xSrxYb0.1MnO3.δ(x=0, 0.025. 0.05, 0.1, and 0.2)were prepared by a conventional solid-state reaction and their thermoelectric properties were evaluated at 303-973 K. Each of the samples consisted of a single phase with an orthorhombic structure. All the samples showed a metallic conductivity and their electrical resistivity was markedly affected by the distortion of the MnO6 octahedron. The Seebeck coefficient of all the samples was negative, indicating that the predominant carriers were electrons over the entire temperature range examined.The highest power factor achieved (0.22 mW m^-1 K^-2 at 773 K) was shown by the sample with x=0.1. The thermal conductivity was affected by both the crystal distortion and the difference in mass between the Ca^2+ and Sr^2+ ions. The highest dimensionless figure of merit obtained was 0.09 at 973 K for the sample with x=0.1; this is a result of its low electrical resistivity and its moderate Seebeck coefficient and thermal conductivity.
American Institite of Physics
2009-05-13
eng
journal article
VoR
http://hdl.handle.net/2237/12623
https://nagoya.repo.nii.ac.jp/records/10780
https://doi.org/10.1063/1.3125450
JOURNAL OF APPLIED PHYSICS
105
9
093717
093717
https://nagoya.repo.nii.ac.jp/record/10780/files/JApplPhys_105_093717.pdf
application/pdf
242.5 kB
2018-02-20