Site-Selective Substitution by Transition Metal Cations for NaCo2O4 via Ion-Exchange
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- NOJIRI Yoshihiro
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University
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- OHTAKI Michitaka
- Interdisciplinary Graduate School of Engineering Sciences, Kyushu University CREST, Japan Science and Technology Agency
Bibliographic Information
- Other Title
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- 遷移金属カチオンを用いたイオン交換による NaCo<sub>2</sub>O<sub>4</sub> のサイト選択元素置換
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Abstract
Incorporation of Ni ions into two different sites of the Na and Co sites of NaCo2O4 was carried out by the processes of conventional elemental substitution for Co ion and solid state ion exchange of mobile Na+ ion. The changes of the lattice parameters of “substituted” and “exchanged” samples were different, suggesting that the Ni ions occupy different sites. The Ni-substituted sample for Co showed a significant decrease of Seebeck coefficient keeping the electrical conductivity almost intact, while Ni-exchanged samples for Na showed a lower electrical conductivity than that of the non-substituted sample with keeping the Seebeck coefficient unchanged. These results suggest that Ni cations introduced to the Co site decouples the Co-Co spin exchange, whereas those at the Na site compensates positive holes by providing conduction electrons.<br>
Journal
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- Journal of the Ceramic Society of Japan
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Journal of the Ceramic Society of Japan 113 (1318), 400-404, 2005
The Ceramic Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390282680254164352
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- NII Article ID
- 110002292321
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- NII Book ID
- AN10040326
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- ISSN
- 18821022
- 09145400
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- NDL BIB ID
- 7386269
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed