| 氧离子辐照二氧化钛单晶后的结构与磁性 |
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| 引用本文： | 丁斌峰,相凤华.氧离子辐照二氧化钛单晶后的结构与磁性[J].化学物理学报,2012,25(1):19-24. |
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| 作者姓名： | 丁斌峰 相凤华 |
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| 作者单位： | 廊坊师范学院物理与电子信息学院，廊坊065000;廊坊师范学院物理与电子信息学院，廊坊065000 |
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| 摘 要： | 氧离子辐照二氧化钛单晶可以诱发其铁磁性．辐照后在室温下也能观察到二氧化钛的铁磁性，且对温度依赖性较小．结合X射线衍射实验、卢瑟福背散射/沟道实验、拉曼散射实验谱、电子自旋共振实验谱、超导量子干涉仪实验、单位原子随沟道位移实验，测定了晶格的损伤随辐照流强的增加而增加．发现在氧离子辐照二氧化钛时出现了Ti3+替代氧空位(OV)的缺陷复合体，即形成Ti3+-OV复合体．这种缺陷复合体导致了局部(TiO6-x)的拉曼模式的伸展．说明了Ti3+结合一个未成对的3d电子是二氧化钛局部铁磁性的起源.
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| 关 键 词： | 卢瑟福背散射/沟道实验，单位原子位移实验，空位与间隙 |
| 收稿时间： | 7/1/2011 12:00:00 AM |
Structural and Magnetic Property of Ion Irradiated TiO2 Single Crystals |
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| Bin-feng Ding and Feng-hua Xiang.Structural and Magnetic Property of Ion Irradiated TiO2 Single Crystals[J].Chinese Journal of Chemical Physics,2012,25(1):19-24. |
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| Authors: | Bin-feng Ding and Feng-hua Xiang |
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| Institution: | Department of Physics and Electronic Information, Langfang Teachers College, Langfang 065000, China;Department of Physics and Electronic Information, Langfang Teachers College, Langfang 065000, China |
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| Abstract: | Ferromagnetism is induced in pure TiO2 single crystals by oxygen ion irradiation. The ferro-magnetism is observed up to room temperature and is with weak temperature dependence. By combining X-ray diffraction, Rutherford backscattering/channelling, Raman scattering, and electron-spin resonance spectroscopy, supperconducting quantum interference device, displacement per atom, we measured the lattice damage accumulation with increasing flu-ences. A defect complex, i.e., Ti3+ on the substitutional accompanied by oxygen vacancies, has been identified in the irradiated TiO2. This kind of defect complex results in a local (TiO6-x) stretching Raman mode. We elucidate that Ti3+ with one unpaired 3d electron provide the local magnetic moments. |
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| Keywords: | Rutherford backscattering/channelling Displacement per atom Vacancy and interstitial |
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