| La1-xTexMnO3晶格结构的X射线粉末衍射分析 |
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| 引用本文： | 谈国太,陈正豪.La1-xTexMnO3晶格结构的X射线粉末衍射分析[J].物理学报,2007,56(3):1702-1706. |
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| 作者姓名： | 谈国太 陈正豪 |
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| 作者单位： | (1)北京凝聚态物理国家实验室，中国科学院物理研究所，北京 100080; (2)射线束技术与材料改性教育部重点实验室,北京师范大学低能核物理所，北京市辐射中心,北京 100875 |
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| 基金项目： | 国家重大基础研究项目基金(批准号：G1998061412)和北京师范大学青年科学基金资助的课题. |
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| 摘 要： | 通过X射线粉末衍射数据，用Rietveld精修方法分析了Te部分替换LaMnO3中La后，其晶格参数及其结构对称性所发生的变化.结果表明：Te掺杂LaMnO3系列样品具有R3C的晶格结构对称性，其MnO6八面体晶格还产生了伸张畸变，畸变程度随Te掺杂量的增加而增大.此外根据Mn—O—Mn键角、eg电子能带的带宽、A位离子平均半径及A位离子尺寸失配度等的变化特点，推测Te掺杂LaMnO3样品除居里温度等相变物理量将随x增加而非线性变化外，还可能产生自旋玻璃态、相分离等宏观现象.
关键词：
庞磁电阻效应
La-Te-Mn-O
X射线衍射
Rietveld精修
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| 关 键 词： | 庞磁电阻效应 La-Te-Mn-O X射线衍射 Rietveld精修 |
| 文章编号： | 1000-3290/2007/56(03)/1702-05 |
| 收稿时间： | 2006-07-28 |
| 修稿时间： | 9/4/2006 12:00:00 AM |
XRD analysis on lattice structure of La1-xTexMnO3 |
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| Tan Guo-Tai and Chen Zheng-Hao.XRD analysis on lattice structure of La1-xTexMnO3[J].Acta Physica Sinica,2007,56(3):1702-1706. |
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| Authors: | Tan Guo-Tai and Chen Zheng-Hao |
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| Institution: | 1. Key laboratory of Beam Technology and Material Modification of Ministry of Eduction, Institute of Low Energy Nuclear Physiscs of Beijing Normal University, Beijing Radiation Center, Beijing 100875, China; 2. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China |
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| Abstract: | Based on X-ray powder diffraction data, the lattice structure and symmetry of La1-xTexMnO3 (0.04≤x≤0.2) have been analyzed by Rietveld refining method. the results show that all samples structure have a rhombohedral symmetry with space group R3C, and the lattice of MnO6 octahedron has a stretching distortion due to the difference in cation size. Besides, the degrec of structure distortion is closely related to Te content and can be depicted with the following three factors: the Mn—O—Mn bond angle θMn—O—Mn, the average A-site radius 〈rA〉 and the A-site sizemismatch σ2. According to the changing trend of these factors, several conjecture on physical properties are discussed, including the Curie temperature, spin-glass and phase separation etc. |
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| Keywords: | colossal magnetoresistance La-Te-Mn-O XRD Rietveld refining |
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