Raman study of Ba-doped ceria nanopowders
Raman study of Ba-doped ceria nanopowders
复制标题
Ba掺杂二氧化铈纳米粉体的拉曼研究
DOI：
10.2298/sos0703281r
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发表时间：
2007
影响因子：
1.5
通讯作者：
Z. Popović
中科院分区：
文献类型：
--
作者：
M. Radović;Z. Dohcevic;M. Šćepanović;M. Grujić;B. Matović;S. Bošković;Z. Popović
采用室温自蔓延法制备了一系列Ce1-xBaxO2-y(5≤x≤0.20)纳米粉末。用X射线衍射仪和Ram-An散射仪对样品进行了室温表征，所有样品都是具有萤石型结构的固溶体，平均晶体尺寸约为5 nm。由于纳米晶粉末的性质，拉曼F2g模的红移和不对称展宽可以很好地解释为约束和应变效应的综合作用。在~560 cm~(-1)和~600 cm~(-1)处出现的附加峰归因于CeO_2晶格中的本征和本征O2空位。高温处理后的拉曼光谱
A series of Ce 1-xBa xO2-y (5 ≤x≤0.20) nanometric powders were synthesized by selfpropagating room temperature synthesis. XRD and Ram an scattering measurements were used to characterize the samples at room temperatur e. All the samples are solid solutions with fluorite type structure with an average crysta llite size about 5 nm. The redshift and asymmetric broadening of the Raman F 2g mode can be well explained with combined confinement and strain effects because of the nanoc rystalline powders nature. The appearance of the additional peaks at ~ 560 cm -1 and ~ 600 cm -1 , are attributed to extrinsic and intrinsic O 2- vacancies in ceria lattice. Raman spectra of tempe rature treated