| Effect of Sr and Ce on Synthesis of Nanometer Perovskite LaMnO3＋λ |
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| 引用本文： | 翁端,吴晓东,徐鲁华,丁红梅,陈震.Effect of Sr and Ce on Synthesis of Nanometer Perovskite LaMnO3＋λ[J].中国稀土学报(英文版),2003,21(1):46-50. |
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| 作者姓名： | 翁端 吴晓东 徐鲁华 丁红梅 陈震 |
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| 作者单位： | DepartmentofMaterialsScienceandEngineering,TsinghuaUniversity,Beijing100084,China |
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| 基金项目： | ProjectsupportedbyAcademicTeacherSustentationFundofMinistryofEducationofChina ( 2 0 0 0～ 2 0 0 1) |
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| 摘 要： | Nanometer perovskite LaMnO3 λ, La0.6Ce0.4MnO3 λ and La0.6Sr0.4MnO3 λ were prepared by citric acid-aide dsol-gel method. The effects of Ce, Sr on the structure and properties of nanometer perovskite were studied through DTTGA, XRD, TEM and BET analyses. The results show that, by sol-gel method, LaMnO3 λ, La0.6Ce0.4MnO3 λ and La0.6Sr0.4MnO3 λ were made with average particle size of about 60, 100 and 30 nm, respectively. After partially substituting Sr on La positions in LaMnO3 λ, it is found that Sr is located at the perovskite lattice so as to reduce the formation temperature of the perovskite. As a result, the perovskite has a smaller particle size and larger specific surface area. On the contrary, it is difficult for Ce to enter the perovskite lattice. Ce exists mostly in the form of CeO2 as partially substituting La in LaMnO3 λ. The formation temperature of the perovskite increases, and the catalyst containing CeO2 presents a larger particle size and less specific surface area.
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| 关 键 词： | 纳米钙钛矿 LaMnO3＋λ 溶胶凝胶法 稀土 锶 铈 |
Effect of Sr and Ce on Synthesis of Nanometer Perovskite LaMnO3+λ |
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| Abstract: | |
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| Keywords: | nano-perovskite sol-gel method A-site s ubstitation rare earthsCLC number: Document code: A Article ID: |
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