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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Identifying Defects in Ceria-Based Nanocrystals by UV Resonance Raman Spectroscopy
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Identifying Defects in Ceria-Based Nanocrystals by UV Resonance Raman Spectroscopy

机译：通过紫外共振拉曼光谱法鉴定基于二氧化铈的纳米晶体中的缺陷

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摘要

Local structures in ceria-based materials were investigated by UV resonance Raman spectroscopy using a 363.8 ran laser line for the first time. In the spectra of a highly crystalline and undoped ceria, overtone LO series are clearly detected due to the multiphonon relaxation by the UV resonance Raman effect. Gd~(3+) doping in ceria additionally activates the disorder bands that are attributable to lattice spaces with or without an oxygen vacancy. The crystal size dependency of the UV Raman spectra suggests that Ce~(3+) ions preferably form the MO8-type (M = Ce~(3+)) complex in the undoped ceria nanoparticles and are eliminated by oxidation while heating in air. Gd~(3+) ions also tend to form a MO8-type complex in the nanocrystalline ceria matrix. However, they diffuse to form the more thermodynamically stable defect clusters that accompany the grain growth upon heating.
机译：首次使用363.8纳米激光线通过UV共振拉曼光谱研究了基于二氧化铈的材料中的局部结构。在高度结晶且未掺杂的二氧化铈的光谱中，由于紫外线共振拉曼效应引起的多声子弛豫，可以清楚地检测到泛音LO系列。二氧化铈中的Gd〜（3+）掺杂还可以激活无序带，该无序带可归因于有或没有氧空位的晶格空间。 UV拉曼光谱的晶体尺寸依赖性表明，Ce〜（3+）离子优选在未掺杂的二氧化铈纳米颗粒中形成MO8型（M = Ce〜（3+））络合物，并在空气中加热时被氧化消除。 Gd〜（3+）离子还倾向于在纳米晶二氧化铈基质中形成MO8型络合物。但是，它们扩散形成热力学上更稳定的缺陷簇，这些缺陷簇在加热时伴随晶粒的生长。

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