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Structural and Magnetic Property of Ion Irradiated TiO2 Single Crystals
Bin-feng Ding*,Feng-hua Xiang
Author NameAffiliationE-mail
Bin-feng Ding* Department of Physics and Electronic Information, Langfang Teachers College, Langfang 065000, China ding_binfeng@126.com 
Feng-hua Xiang Department of Physics and Electronic Information, Langfang Teachers College, Langfang 065000, China  
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.
Key words:  Rutherford backscattering/channelling, Displacement per atom, Vacancy and interstitial
FundProject:
氧离子辐照二氧化钛单晶后的结构与磁性
丁斌峰*,相凤华
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.
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
DOI:10.1088/1674-0068/25/01/19-24
分类号: