2013 Fiscal Year Final Research Report
Off-stoichiometry effect on the thermoelectric properties of the pseudogap Heusler compounds
| Project/Area Number |
23360279
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Nagoya Institute of Technology |
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Principal Investigator |
NISHINO Yoichi 名古屋工業大学, 工学(系)研究科(研究院), 教授 (50198488)
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| Co-Investigator(Kenkyū-buntansha) |
SODA Kazuo 名古屋大学, 大学院・工学研究科, 教授 (70154705)
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| Project Period (FY) |
2011-04-01 – 2014-03-31
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| Keywords | ホイスラー化合物 / 擬ギャップ / 熱電変換材料 / ゼーベック効果 / 価電子濃度 / 非化学量論組成 / 光電子分光 / 電子構造 |
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| Research Abstract |
A combination of a large Seebeck coefficient and a low electrical resistivity has been obtained for the off-stoichiometric Fe2-xV1+xAl alloys owing to the doping of quaternary elements. On the basis of the valence electron concentration (VEC) dependence of the Seebeck coefficient, a large negative value of -180 microV/K can be obtained for the V-rich (x>0) alloys, whilst good p-type materials with 110 microV/K are derived from the Fe-rich (x<0) alloys. Because of the V/Al off-stoichiometry effect, a large Seebeck coefficient as well as a low electrical resistivity has also been found for Fe2V1+xAl1-x and Fe2VTaxAl1-x alloys, together with a large shift of their peak temperatures towards high temperatures of 400-600 K. The heavy element Ta doping combined with the off-stoichiometry effect leads to a significant decrease in the thermal conductivity, so that the dimensionless figure of merit reaches ZT=0.22 at around 400-500 K.
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[Journal Article] Soft X-ray Photoemission Study of Thermoelectric Alloys Fe_<2-x-y>Ir_yV_<1+x>Al and Fe_<2-x>V_<1+x-y>Ti_yAl2011
Author(s)
K. Soda, S. Harada, M. Kato, S. Yagi, M. Inukai, H. Miyazaki,Y. Sandaiji, Y. Tamada, S. Tanaka, T. Sugiura, Y. Nishino
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Journal Title
J. Electron Spectrosc. Rel. Phenom
Volume: 184巻
Pages: 236-239
DOI
Peer Reviewed
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