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Room-Temperature Ferromagnetism in Semiconducting TiO2-δ Nanoparticles
引用本文:赵倩,;吴萍,;李宝凌,;卢遵铭,;姜恩永.Room-Temperature Ferromagnetism in Semiconducting TiO2-δ Nanoparticles[J].中国物理快报,2008,25(5):1811-1814.
作者姓名:赵倩  ;吴萍  ;李宝凌  ;卢遵铭  ;姜恩永
基金项目:Supported by the National Natural Science Foundation of China under Grant No 50674071, the Tianjin Natural Science Foundation (06YFJZJC01300), the Programme for New Century Excellent Talents in University (NCET-06-0245), and the Platform Project of Tianjin for Innovation in Science and Technology and Environmental Construction (06TXTJJC13900).
摘    要:TiO2-δ nanoparticles are synthesized by the sol-gel method and annealed under different reducing atmosphere. The x-ray diffraction patterns show that anatase is the dominant phase with small amounts of the futile phase of TiO2-δ for all the samples. Magnetic measurements indicate that the samples annealed in reducing atmosphere exhibit unprecedented room-temperature ferromagnetism, in particular, the saturation magnetization Ms is up to about 8.6 × 10^-3 emu/g for the sample annealed in H2/Ar mixture. Analysis of the x-ray photoelectron spectroscopy spectra for the samples processed under different conditions indicates that the amounts of Ti^3+ or Ti^2+ cations, namely, the concentration of oxygen vacancies, increase with intensifying reducing atmosphere during processing, which shows that ferromagnetism in this material strongly depends on the concentration of oxygen vacancies. The relationships between the ferromagnetism and the crystal structure as well as the grain size in this material are also discussed.

关 键 词:室内温度  纳米颗粒  铁磁性  半导体
收稿时间:2007-10-21

Room-Temperature Ferromagnetism in Semiconducting TiO2-δ Nanoparticles
ZHAO Qian,WU Ping,LI Bao-Ling,LU Zun-Ming,JIANG En-Yong.Room-Temperature Ferromagnetism in Semiconducting TiO2-δ Nanoparticles[J].Chinese Physics Letters,2008,25(5):1811-1814.
Authors:ZHAO Qian  WU Ping  LI Bao-Ling  LU Zun-Ming  JIANG En-Yong
Institution:Department of Applied Physics, Institute of Advanced Materials Physics, School of Science, Tianjin University, Tianjin 300072Tianjin Key Laboratory of Low-Dimensional Materials Physics and Preparing Technology, Tianjin University, Tianjin 300072College of Materials, Hebei University of Technology, Tianjin 300130
Abstract:
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