| Ce1-xGdxO2-δ固溶体中缺陷物种的拉曼光谱研究 |
| Defect Sites in the Ce1-xGdxO2-δ Solid Solutions by Raman Spectroscopy |
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| 摘要: 采用溶胶-凝胶法制备一系列Ce1-xGdxO2-δ固溶体。利用紫外(325 nm)和可见(514 nm)Raman光谱，X射线粉末衍射(XRD)，透射电子显微镜(TEM)和紫外可见漫反射光谱(UV-Vis DRS)，考察了Ce1-xGdxO2-δ固溶体的缺陷物种的分布以及Gd含量对缺陷浓度的影响。结果表明：Ce1-xGdxO2-δ固溶体中存在氧缺位(~560 cm-1)和GdO8型缺陷结构(~600 cm-1)。根据样品对Raman激发光的吸收，紫外Raman光谱反映样品的表层信息，可见Raman光谱反映样品的整体信息。Ce1-xGdxO2-δ固溶体表层氧缺位(να)和GdO8型缺陷物种的浓度(νβ)均高于固溶体体相，这归因于缺陷物种的表面富集。然而，相比于GdO8型缺陷物种，体相中氧缺位浓度增加较表层中的更显著。 |
| 关键词: Raman光谱 Ce1-xGdxO2-δ固溶体 缺陷物种 |
| 基金项目: |
| Abstract: A series of Ce1-xGdxO2-δ solid solutions were prepared using a sol-gel method, Raman spectroscopy with 325 and 514 nm excitation wavelengths, X-ray diffraction (XRD), transmission electron microscopy images (TEM) and UV-Vis diffuse reflectance spectra (UV-Vis DRS) were used to analyze the distributions of defect sites in Ce1-xGdxO2-δ solid solutions and the effect of Gd content on their concentration. There were two defect sites of oxygen vacancies and GdO8-type complex corresponding to the Raman peaks at 560 cm-1 and 600 cm-1, respectively. The UV Raman spectroscopy could provide the surface information, while the Visible Raman spectroscopy could get the whole information of the sample. The concentration of oxygen vacancies and GdO8-type complex were higher on the surface than in the bulk due to the surface enrichment. However, comparing with the concentration of GdO8-type complex, the increase in the concentration of oxygen vacancies in the bulk was more obvious than that of in the surface. |
| Keywords: Raman spectroscopy Ce1-xGdxO2-δ solid solutions defect sites |
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| 李 岚,胡庚申,陈 芳,罗孟飞.Ce1-xGdxO2-δ固溶体中缺陷物种的拉曼光谱研究[J].无机化学学报,2012,28(1):20-24. |
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