Structure and Dielectric Study of Ce₃ NbO_7+δ

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• 作者：Zhang Guoguang ; Li Qin ; Fang Qianfeng
• 关键词：oxide ion conductor ; dielectric relaxation ; rare earths
• 刊名：Journal of Rare Earths
• 出版年：2007
• 出版时间：December 2007
• 年：2007
• 卷：25
• 期：6
• 页码：730-733
• 全文大小：351 K

文摘

The structure, phase composition, and migration of oxygen ion in Ce₃NbO_7+δ were reported on the basis of lone-pair substitution concept. X-ray diffraction study revealed that Ce₃NbO_7+δ sample was comprised of Ce₃NbO_7+δ phase and CeNbO_4.25 phase. In the dielectric study of Ce₃NbO_7+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 Ce₃NbO_7+δ phase and CeNbO_4.25 phase gave rise to the two dielectric relaxation peaks.