The lattice thermal conductivity of the Al-Mn-Si C54-phase, which possesses a large magnitude of the Seebeck coefficient and metallic electrical conduction, was greatly reduced by partial substitution of the heavy elements Ru and Re for Mn; these were selected by first principles calculations so as not to produce impurity states near the chemical potential. The heavy element substituted Al-Mn-Si-based C54-phase showed a drastic increase in the dimensionless of figure of merit ZT due to the reduction of the lattice thermal conductivity together with the unchanged electrical properties. The maximum ZT value of the p-type sample and the n-type sample reached 0.12 at 520 K and 0.38 at 540 K, respectively. These values are about five times larger than that of the heavy element-free Al-Mn-Si C54-phase.
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14 January 2014
Research Article|
January 13 2014
Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re)
Akio Yamamoto;
Akio Yamamoto
1
Department of Crystalline Materials Science, Nagoya University
, Nagoya 464-8603, Japan
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Hidetoshi Miyazaki;
Hidetoshi Miyazaki
2
Department of Frontier Materials, Nagoya Institute of Technology
, Nagoya 466-855, Japan
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Tsunehiro Takeuchi
Tsunehiro Takeuchi
1
Department of Crystalline Materials Science, Nagoya University
, Nagoya 464-8603, Japan
3
EcoTopia Science Institute, Nagoya University
, Nagoya 464-8603, Japan
4
PRESTO, Japan Science and Technology Agency
, Tokyo 102-0076, Japan
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J. Appl. Phys. 115, 023708 (2014)
Article history
Received:
November 08 2013
Accepted:
December 23 2013
Citation
Akio Yamamoto, Hidetoshi Miyazaki, Tsunehiro Takeuchi; Thermoelectric properties of Al-(Mn,X)-Si C54-phase (X = Ru and Re). J. Appl. Phys. 14 January 2014; 115 (2): 023708. https://doi.org/10.1063/1.4861643
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