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- Funahashi Ryoji
- Department of Energy Conversion, Osaka National Research Institute
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- Matsubara Ichiro
- Department of Energy Conversion, Osaka National Research Institute
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- Ikuta Hiroshi
- Center for Integrated Research in Science and Engineering, Nagoya University
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- Takeuchi Tsunehiro
- Department of Crystalline Materials Science, Nagoya University
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- Mizutani Uichiro
- Department of Crystalline Materials Science, Nagoya University
書誌事項
- タイトル別名
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- Thermoelectric Properties of (Ca, Sr, Bi)<SUB>2</SUB>Co<SUB>2</SUB>O<SUB>5</SUB> Whiskers
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Thermoelectric properties of (Ca, Sr, Bi)2Co2O5 (Co-225) single crystalline whiskers with a layered structure were measured over a wide temperature range 100–973 K . Both Seebeck coefficient and electrical resistivity exhibited fairly complex temperature dependences in this temperature range. The whole temperature range studied is divided into four distinct regions (I) to (IV), depending on observed characteristic temperature dependences of both Seebeck coefficient and electrical resistivity. From more or less linearly temperature dependent Seebeck coefficient in region (I) in combination with unique temperature dependences of both resistivity and Hall coefficient, we conclude the presence of a small pseudogap with a width of a few meV across the Fermi level. Complex magnetic properties are observed: the antiferromagnetic transition at 22 K but the hysteresis in the M-H curve remains up to room temperature. This is taken as evidence for the existence of Co atoms situated in different magnetic environments. The possession of large Seebeck coefficients exceeding 100 \\microV K−1 in this system is attributed to the presence of the pseudogap at the Fermi level.
収録刊行物
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- MATERIALS TRANSACTIONS
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MATERIALS TRANSACTIONS 42 (6), 956-960, 2001
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
- 1390001204248376960
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- NII論文ID
- 130004451514
- 30018849076
- 10006549451
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- NII書誌ID
- AA1151294X
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- COI
- 1:CAS:528:DC%2BD3MXlvVGnurY%3D
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- ISSN
- 13475320
- 13459678
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- NDL書誌ID
- 5823911
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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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- 使用不可