| LaFe1－xCrxO3系列氧化物的EXAFS研究 |
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| 引用本文： | 王嘉鸥,杜永华,奎热西,洪才浩,谢亚宁,胡天斗. LaFe1－xCrxO3系列氧化物的EXAFS研究[J]. 中国物理 C, 2007, 31(1): 101-103 |
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| 作者姓名： | 王嘉鸥 杜永华 奎热西 洪才浩 谢亚宁 胡天斗 |
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| 作者单位： | [1]兰州大学,兰州730000 [2]中国科学院高能物理研究所,北京100049 |
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| 摘 要： | 采用固相反应法, 制备了钙钛矿结构氧化物LaFe1－xCrxO3较宽范围内(x=0.0—0.7)的系列单相样品, 并测量了各样品的X射线衍射谱(XRD)和扩展X射线吸收精细结构(EXAFS)谱. 通过对XRD的分析样品均为钙钛矿结构正交相, 同时晶格常数随着掺杂量x的增加而减小. 通过对EXAFS的分析和研究得到在LaFe1－xCrxO3氧化物中Fe-O键长和Fe-La键长随掺杂浓度x的变化, 发现Fe-La键长发生比较大的变化, 说明La在体系掺杂中对结构的稳定起到重要作用.
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| 关 键 词： | ABO3(钙钛矿结构) XRD(X射线衍射谱) EXAFS(扩展X射线吸收精细结构谱) |
| 收稿时间： | 2006-03-14 |
| 修稿时间： | 2006-03-14 |
Study on Perovskite Oxides LaFe1-xCrxO3 by EXAFS |
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| WANG Jia-Ou,DU Yong-Hua,Kurash Ibrahim,HONG Cai-Hao,XIE Ya-Ning,HU Tian-Dou. Study on Perovskite Oxides LaFe1-xCrxO3 by EXAFS[J]. High Energy Physics and Nuclear Physics, 2007, 31(1): 101-103 |
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| Authors: | WANG Jia-Ou DU Yong-Hua Kurash Ibrahim HONG Cai-Hao XIE Ya-Ning HU Tian-Dou |
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| Affiliation: | 1.Lanzhou University, Lanzhou 730000, China;2.Institute of High Energy Physics, CAS, Beijing 100049, China |
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| Abstract: | Perovskite oxides LaFe_(1-x)Cr_xO_3 were synthesized by solid state reaction method.X-ray powder diffraction was tested to characterize the crystalline structure of the samples.The result indicates that the samples are single orthorhombic phase.The lattice parameter decreases with the Chromium concentration.The extend X-ray absorption fine structures(EXAFS)of the Fe K-edge as a function of doping level x show that the Fe-La bonds distance decreases dramatically.This suggests that Lanthanum is very important for the stability of the whole LaFe_(1-x)Cr_xO_3 structure. |
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| Keywords: | perovskite structure X ray diffraction (XRD) extend X ray absorption fine structure (EXAFS) |
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