arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0908.1224cond-mat.mtrl-scicond-mat.mes-hall
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Fe- ZnO纳米棒电子结构的X射线吸收精细结构研究

Electronic structure studies of Fe- ZnO nanorods by x-ray absorption fine structure

Sanjeev Gautam, S. Kumar, P. Thakur, K. H. Chae, Ravi Kumar, C. G. Lee

摘要:

采用共沉淀法合成了多晶Zn_{1-x} Fe_xO(x = 0.0,0.01,0.03和0.05)纳米棒,利用X射线吸收精细结构(XAFS)研究了其电子结构. X射线衍射(XRD)结果表明,Fe掺杂ZnO晶体为单相纤锌矿结构,无第二相。从XRD图谱中观察到,随着Fe掺杂,峰位置向低2θ值移动。随着Fe含量的增加,峰位置的变化清楚地表明Fe离子正在取代ZnO基质中的Zn离子。Fe K边的线性组合拟合(LCF)表明Fe以混合价态(Fe 3 +/Fe 2+)存在,Fe 3+:Fe 2+的比例约为7:3。利用IFEFFIT和Artemis对XAFS数据进行了拟合。结果表明,Fe以四面体对称的方式取代了ZnO基体中的Zn位.

英文摘要:

We report the electronic structure studies of well characterized polycrystalline Zn_{1-x}Fe_xO (x = 0.0, 0.01, 0.03, and 0.05) nanorods synthesized by a co-precipitation method through x-ray absorption fine structure (XAFS). X-ray diffraction (XRD) reveals that Fe doped ZnO crystallizes in a single phase wurtzite structure without any secondary phase. From the XRD pattern, it is observed that peak positions shift towards lower 2θvalue with Fe doping. The change in the peak positions with increase in Fe contents clearly indicates that Fe ions are replacing Zn ions in the ZnO matrix. Linear combination fittings (LCF) at Fe K-edge demonstrate that Fe is in mixed valent state (Fe3+/Fe2+) with a ratio of ~ 7:3 (Fe3+:Fe2+). XAFS data is successfully fitted to wurtzite structure using IFEFFIT and Artemis. The results indicate that Fe substitutes Zn site in the ZnO matrix in tetrahedral symmetry.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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