| 钴基掺杂氧化物结构特征的研究 |
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| 引用本文： | 吴成国,董秋云,何苏红,杜华月,陈磊.钴基掺杂氧化物结构特征的研究[J].低温物理学报,2009(3). |
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| 作者姓名： | 吴成国 董秋云 何苏红 杜华月 陈磊 |
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| 作者单位： | 解放军理工大学理学院; |
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| 基金项目： | 国家科技部(项目编号:NKBRSG-G1999064602)~~ |
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| 摘 要： | 利用溶胶-凝胶(sol-gel)法制备出了一系列La0.8Sr0.2Co1-xFexO3样品.xRD结果显示,在La0.8Sr0.2Co1-xFexO3系列样品中,未掺杂的La0.8Sr0.2CoO3样品具有很好的单相结构,并且衍射峰没有发生劈裂;而Fe掺杂的La0.8Sr0.2CoO3样品中几乎每个衍射峰都发生了劈裂,在Fe掺杂的La0.8Sr0.2CoO3样品中可能存在两种不同的晶体结构.利用xANES研究了La0.8Sr0.2Co1-xFexO3样品中Co离子和Fe离子的化合价发现,Fe离子存在两种不同的化合价态,即Fe3+和Fe4+离子,在La0.8Sr0.2Co1-xFexO3样品中形成了两个不同离子的富集区,一个是由Co3+、Co4+和Fe3+等离子组成的,一个是由Fe4+和Co3+、Co4+等离子组成的,因此在Fe掺杂的La0.8Sr0.2CoO3样品中存在两种不同的晶体结构.
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| 关 键 词： | xANES 劈裂 化合价 溶胶-凝胶 |
THE STUDY OF STRUCTURAL FEATURES IN DOPED CO-BASED OXIDES SYSTEM |
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| WU Cheng-guo DONG Qiu-yun HE Su-hong DU Hua-yue CHEN Lei Institute of Science,PLA University of Science , Technology,nanjing.THE STUDY OF STRUCTURAL FEATURES IN DOPED CO-BASED OXIDES SYSTEM[J].Chinese Journal of Low Temperature Physics,2009(3). |
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| Authors: | WU Cheng-guo DONG Qiu-yun HE Su-hong DU Hua-yue CHEN Lei Institute of Science PLA University of Science Technology nanjing |
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| Institution: | WU Cheng-guo DONG Qiu-yun HE Su-hong DU Hua-yue CHEN Lei Institute of Science,PLA University of Science , Technology,nanjing 210007 |
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| Abstract: | The polycrystalline samples of La0.8Sr0.2Co1-xFexO3 were prepared by the sol-gel method. xRD shows that in La0.8Sr0.2Co1-xFexO3 system the undoped La0.8Sr0.2CoO3 sample has a single phase,and the diffraction peaks do not split; but in Fe-doped La0.8Sr0.2CoO3 samples almost all of the diffraction peaks are splitted,implying that there are probably two different crystal structures in Fe-doped La0.8Sr0.2CoO3 samples. The results of xANES indicate that Fe ions have two different valences such as Fe3+ and Fe4+ i... |
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| Keywords: | ExAFS split valence the sol-gel method |
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