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| Structure and Dielectric Study of Ce3 NbO7＋δ | |
| 引用本文： | 张国光,李琴,方前锋. Structure and Dielectric Study of Ce3 NbO7＋δ[J]. 中国稀土学报(英文版), 2007, 25(6): 730-733. DOI: 10.1016/S1002-0721(08)60016-2 |
| 作者姓名： | 张国光 李琴 方前锋 |
| 作者单位： | Zhang Guoguang（School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China） ;Li Qin（School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China） ;Fang Qianfeng（School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China;Key Laboratory of Materials Physics,Institute of Solid State Physics,Chinese Academy of Sciences,Hefei 230031,China） ; |
| 基金项目： | Project supported by the National Natural Science Foundation of China (50202012, 50672100)and Natural Science of Jiangxi Province (0550090) |
| 摘 要： | The structure, phase composition, and migration of oxygen ion in Ce3 NbO7＋δ were reported on the basis of lone-pair substitution concept. X-ray diffraction study revealed that Ce3 NbO7＋δ sample was comprised of Ce3 NbO7＋δ phase and CeNbO4.25 phase. In the dielectric study of Ce3 NbO7＋δ sample, two dielectric loss peaks were observed both in temperature spectra and frequency spectra. Both peaks were shifted towards higher temperature with increase in frequency in temperature spectra and towards higher frequency with increase in temperature in frequency spectra, indicating the relaxation essence of these two peaks. It was suggested that the short distance diffusions of oxygen ions in both Ce3 NbO7＋δ phase and CeNbO4.25 phase gave rise to the two dielectric relaxation peaks. |
| 关 键 词： | 氧化物 材料结构 电介质 稀土 |
| 收稿时间： | 2007-03-13 |
| 修稿时间： | 18 July 2007. |
Structure and Dielectric Study of Ce3 NbO7+δ |
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| Zhang , Li Qin,Fang Qianfeng,. Structure and Dielectric Study of Ce3 NbO7+δ[J]. Journal of Rare Earths, 2007, 25(6): 730-733. DOI: 10.1016/S1002-0721(08)60016-2 | |
| Authors: | Zhang Li Qin Fang Qianfeng |
| Affiliation: | [1]School of Materials Science and Engineering Nanchang Hangkong University, Nanchang 330063, China [2]Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, China |
| Abstract: | The structure, phase composition, and migration of oxygen ion in Ce3NbO7+δ were reported on the basis of lone-pair substitution concept. X-ray diffraction study revealed that Ce3NbO7+δ sample was comprised of Ce3NbO7+δ phase and CeNbO4.25 phase. In the dielectric study of Ce3NbO7+δ sample, two dielectric loss peaks were observed both in temperature spectra and frequency spectra. Both peaks were shifted towards higher temperature with increase in frequency in temperature spectra and towards higher frequency with increase in temperature in frequency spectra, indicating the relaxation essence of these two peaks. It was suggested that the short distance diffusions of oxygen ions in both Ce3NbO7+δ phase and CeNbO4.25 phase gave rise to the two dielectric relaxation peaks. |
| Keywords: | oxide ion conductor dielectric relaxation rare earths |
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