Effect of Oxygen Content on Thermoelectric Properties of n-Type (Bi,Sb)2(Te,Se)3 Alloys Prepared by Rapid Solidification and Hot-Pressing Techniques
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- Horio Yuma
- Department of Materials Science, Tohoku University
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- Inoue Akihisa
- Institute for Materials Research, Tohoku University
書誌事項
- タイトル別名
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- Effect of Oxygen Content on Thermoelectric Properties of n-Type (Bi,Sb)<SUB>2</SUB>(Te,Se)<SUB>3</SUB> Alloys Prepared by Rapid Solidification and Hot-Pressing Techniques
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Influence of oxygen content on the microstructure and thermoelectric properties of bismuth-telluride based (Bi,Sb)2(Te,Se)3 alloys has been investigated. The consolidated specimens in a disc form of 10 and 26 mm in diameter and 8 mm in height were prepared by hot-pressing of rapidly solidified foils produced by a single-roller melt spinning method. Oxygen content was analyzed to be enriched in the range of 4.1 nm depth from the foil or powder surface. By the reduction-treatment process in a hydrogen atmosphere, the enriched oxygen content on the surface was decreased. For the hot-pressed specimens, the highest oxygen content was 519 ppm and the oxygen-rich area lies along the grain boundaries. As the oxygen content decreased, the carrier mobility (μ) was increased and the electrical resistivity (ρ) was decreased. The reduction of oxygen content by the reduction process using hydrogen gas causes the increase of μ, leading to high value of figure of merit (Z). For the specimens containing the oxygen content of 79 ppm, the maximum Z value of 3.4×10−3 K−1 was obtained. There was a tendency for grain size to increase with increasing oxygen content in the hot-pressed specimens.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 47 (5), 1412-1416, 2006
公益社団法人 日本金属学会
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詳細情報 詳細情報について
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- CRID
- 1390282679227971712
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- NII論文ID
- 10017490527
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- NII書誌ID
- AA1151294X
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 7915066
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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
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