纳米La^(3+)-Eu^(3+)共掺杂CeO_2基固溶体的合成及微结构表征

Hydrothermal Synthesis and Microstructure Characterization of Nanosized La^(3+)-Eu^(3+)Co-doped CeO_2-based Solid Solutions

采用水热法合成La3+、Eu3+共掺杂纳米Ce1-x(La0.5Eu0.5)x O2-δ固溶体。利用X射线衍射技术(XRD)表征样品的相结构,并对固溶体的晶胞参数进行拟合。通过拉曼光谱及紫外可见漫反射光谱表征其电子跃迁性能及掺杂效应。XRD结果表明,双离子掺杂固溶限不小于x=0.30,样品晶粒尺寸小于20 nm,晶胞参数随着掺杂量的升高而逐渐增大。Raman光谱F2g振动峰的逐渐宽化及向低波数方向移动。紫外漫反射光谱表明,随着掺杂量的增大,固溶体能隙先蓝移后红移。

La^3＋ and Eu^3＋ co- doped nanosized Ce1-x （La0.5 Eu0.5 ）xO2-δ solid solutions were obtained via hydrothermal method. The structure of the solid solutions and the cell parameters were characterized by XRD analysis technique, the electron transition properties and doped effects were measured by Raman spectrum technique and UV - Vis diffraction spectrum. XRD results showed that the solid solubility limit exceed O. 30. The particles size was below 20 nm. By increasing the doped content, the cell parameter kept increasing. The F^2g Raman mode also showed a downshift, and the peaks gradually became broader, which further proved the influence of the dopant. The UV - Vis diffraction spectrums of the solid solutions showed that the band gap energy first increase and then decrease.