Oxygen vacancy-induced room-temperature ferromagnetism in D-D neutron irradiated single-crystal TiO2 (001) rutile |
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作者姓名: | 许楠楠 李公平 潘小东 王云波 陈景升 包良满 |
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作者单位: | School of Nuclear Science and Technology, Lanzhou University;State Key Laboratory of Crystal Material, Shandong University;Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University;Department of Materials Science and Engineering, National University of Singapore;Shanghai Institute of Applied Physics, Chinese Academy of Sciences |
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基金项目: | Project supported by the Open Project of Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education,Lanzhou University(Grant No.LZUMMM2012003);the Open Project of Key Laboratory of Beam Technology and Material Modification of Ministry of Education,Beijing Normal University(Grant No.201204);the Open Project of State Key Laboratory of Crystal Material,Shandong University,China(Grant No.KF1311) |
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摘 要: | Remarkable room temperature ferromagnetism in pure single-crystal rutile TiO2 (001) samples irradiated by D-D neutron has been investigated. By combining X-ray diffraction and positron annihilation lifetime, the contracted lattice has been clearly identified in irradiated TiO2, where Ti4+ ions can be easily reduced to the state of Ti3+. As there were no magnetic impurities that could contaminate the samples during the whole procedure, some Ti3+ ions reside on interstitial or substituted sites accompanied by oxygen vacancies should be responsible for the ferromagnetism.
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关 键 词: | 金红石TiO2 纳米TiO2 铁磁性 氧空位 中子辐照 单晶 室温 正电子湮没寿命 |
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