An Oxide Single Crystal with High Thermoelectric Performance in Air.
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- Funahashi Ryoji
- Osaka National Research Institute, AIST, Midorigaoka, Ikeda, Osaka 563-8577, Japan
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- Matsubara Ichiro
- Osaka National Research Institute, AIST, Midorigaoka, Ikeda, Osaka 563-8577, Japan
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- Ikuta Hiroshi
- Center for Integrated Research in Science and Engineering, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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- Takeuchi Tsunehiro
- Department of Crystalline Materials Science, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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- Mizutani Uichiro
- Department of Crystalline Materials Science, Nagoya University, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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- Sodeoka Satoshi
- Osaka National Research Institute, AIST, Midorigaoka, Ikeda, Osaka 563-8577, Japan
書誌事項
- タイトル別名
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- Oxide Single Crystal with High Thermoelectric Performance in Air
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抄録
An oxide single-crystalline whisker with high thermoelectric properties at temperatures (T) higher than 600 K in air has been discovered. This whisker is assigned to Ca2Co2O5 phase (abbreviated to Co-225 whiskers) and has a layered structure in which Co–O layers of two different kinds alternate in the direction of the c-axis. Seebeck coefficient of the whiskers is higher than 100 μV·K-1 at 100 K and increases with temperature up to 210 μV·K-1. Temperature dependence of electric resistivity shows a semiconducting-like behavior. These results indicate that the electric carriers are transported via hopping conduction. Using thermal conductivity of a Co-225 polycrystalline sample, figure of merit (ZT) of the Co-225 whiskers is estimated 1.2–2.7 at T ≥ 873 K. This compound is characterized with regard to low mobility and high density of carriers, which contradicts the conventional materials with high thermoelectric properties.
収録刊行物
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- Japanese Journal of Applied Physics
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Japanese Journal of Applied Physics 39 (11B), L1127-L1129, 2000
The Japan Society of Applied Physics
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詳細情報
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- CRID
- 1390001206253128576
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- NII論文ID
- 210000048307
- 110004093550
- 130004526815
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- NII書誌ID
- AA10650595
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- COI
- 1:CAS:528:DC%2BD3cXosFKrtbk%3D
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- ISSN
- 13474065
- 00214922
- http://id.crossref.org/issn/13474065
- http://id.crossref.org/issn/00214922
- http://id.crossref.org/issn/07217250
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- NDL書誌ID
- 5574604
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 使用不可