| Yttrium掺杂La0.67Ca0.33MnO3的X射线衍射研究 |
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| 引用本文： | 李维俭,沙昊.Yttrium掺杂La0.67Ca0.33MnO3的X射线衍射研究[J].内蒙古大学学报(自然科学版),2005,36(4):387-390. |
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| 作者姓名： | 李维俭 沙昊 |
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| 作者单位： | 上海理工大学,理学院,上海,200093;南京大学物理系,南京,210093 |
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| 摘 要： | 制备了Yttrium掺杂的La0.67Ca0.33MnO3多晶样品.通过室温下的X射线衍射,用Rietveld精修方法得到它的结构特性.随着Yttrium成分的增加,或者La位阳离子的平均半径的降低,八面体倾斜变形度增加.Mn-O-Mn键的键角随Yttrium成分的增加而增加.Mn-O键的平均键长在整个过程中相对保持不变,但单个Mn-O键长和Mn-O-Mn键角反映出室温下Yttrium掺杂LCMO合作Jahn-Teller效应的存在.
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| 关 键 词： | X射线衍射 Yttrium掺杂 La0.67Ca0.33MnO3 |
| 文章编号： | 1000-1638(2005)04-0387-04 |
| 修稿时间： | 2004年10月12 |
Study on X-ray Diffraction of Yttrium Doped La0.67Ca0.33MnO3 |
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| LI Wei-jian,SHA Hao.Study on X-ray Diffraction of Yttrium Doped La0.67Ca0.33MnO3[J].Acta Scientiarum Naturalium Universitatis Neimongol,2005,36(4):387-390. |
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| Authors: | LI Wei-jian SHA Hao |
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| Institution: | LI Wei-jian~1,SHA Hao~2 |
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| Abstract: | Polycrystalline samples of yttrium doped La_(0.67)Ca_(0.33)MnO_3 (LCMO) has been prepared.Structure characterizations have been carried out at room temperature by X-ray diffraction with Rietveld refinements.The octahedral tilting distortion increases with the increase of yttrium content or the decrease of the average radius of La-site cations,.The difference between the two crystallographically distinct Mn-O-Mn bond angle increases with Y content.The average Mn-O bond distance is relatively constant across the entire series,but individual Mn-O bond distances and the Mn-O-Mn bond angles show the presence of the cooperative Jahn-Teller effect at room temperature in yttrium doped LCMO. |
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| Keywords: | X-ray diffraction yttrium doping La_(0 67)Ca_(0 33)MnO_3 |
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