| CexPr1-xO2-δ复合氧化物的XRD和Raman表征 | |
| XRD and Raman Characterizations of CexPr1-xO2-δ Mixed Oxides | |
| 摘要: | |
| 关键词: CexPr1-xO2-δ复合氧化物 XRD Raman 氧空穴 | |
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| Abstract: A series of CexPr1-xO2-δ mixed oxides were synthesized by sol-gel method and characterized by Raman and XRD techniques. When x value was changed from 1.0 to 0.5, only a cubic phase CeO2 was observed. The samples were very well crystallized on decreasing x from 0.50 to 0.99. For CexPr1-xO2-δ samples 465 cm-1 and 1 150 cm-1 Raman peaks are attributed to the Raman active F2g mode of CeO2. The broad peak at about 570 cm-1 in the region of 0.3 ≤x≤ 0.99 can be linked to lattice defects resulting in oxygen vacancies. The new band at about 195 cm-1 may be attributed to the asymmetric vibration caused by the formation of oxygen vacancies. Calcination temperatures had great effect on the peak intensity for CeO2 but less effect on Ce0.8Pr0.2O2-δ in Raman spectra. It might be due to the transformation of the colors for the mixed oxides, the insertion of Pr atom into the ceria lattice could enhance the sintering resistance and thermal stability of the mixed oxides. | |
| Keywords: CexPr1-xO2-δ mixed oxides XRD Raman oxygen vacancies | |
| 投稿时间：2004-08-03 修订日期：2004-11-05 | |
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| 闫宗兰,罗孟飞,谢冠群,黄炜,谢云龙.CexPr1-xO2-δ复合氧化物的XRD和Raman表征[J].无机化学学报,2005,21(3):425-428. | |
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