Effects of KCl Addition on the K2CO3 Flux Growth of Ca3Co4O9 Crystals for a Thermoelectric Device
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概要
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Crystals of Ca3Co4O9 were grown by a solution method. We found that an appropriate amount of KCl addition to the K2CO3 flux can facilitate the growth of Ca3Co4O9 crystals and suppress the crystallization of Ca3Co2O6, which is the decomposed phase of Ca3Co4O9. Using a flux composition of $\text{K$_{2}$CO$_{3}$}:\text{KCl}=4:1$, we obtained large single Ca3Co4O9 crystals possessing a well-grown $ab$-plane. The largest crystal formed had a size of about $4.5\times 2.5\times 0.02$ mm3. The in-plane electrical resistivity and Seebeck coefficient at 300 K are 12 m$\Omega$cm and 150 μV/K, respectively. The Seebeck coefficient exhibited is slightly larger than previously reported values.
- 2003-06-15
著者
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OHTSUKA Shigeki
Department of Electrical Engineering, Osaka University
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FUNAHASHI Ryoji
National Institute of Advanced Industrial Science and Technology
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SHIKANO Masahiro
National Institute of Advanced Industrial Science and Technology
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Yoshimura Masashi
Department Of Applied Biological Chemistry The University Of Tokyo
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Mikami Masashi
Department Of Electrical Engineering Osaka University
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Mori Yusuke
Department Of Applied Chemistry School Of Science And Engineering Waseda University
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Sasaki Takatomo
Department Of Electrical Electronic And Information Engineering Osaka University
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Shikano Masahiro
National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka 563-8577, Japan
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Ohtsuka Shigeki
Department of Electrical Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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Mikami Masashi
Department of Chemistry, Faculty of Science, Tohoku University
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