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采用溶胶凝胶法制备了稀磁半导体Ti1-xFexO2(x=0~0.050)的纳米颗粒,在氩气氛围中以500℃对样品进行退火处理,并通过差热/热重综合热分析仪(TG-DTA)、X射线衍射仪(XRD)、拉曼光谱(Raman)分析了纳米颗粒的结构和相变温度。使用振动样品磁场计(VSM)测试了样品的磁性能。研究发现:经500℃氩气氛围下退火处理后,样品均为锐钛矿结构,并且随掺杂量增加晶粒尺寸减小。VSM测试结果表明,样品在中心区域均出现明显的磁滞现象。
Nanoparticles of dilute magnetic semiconductors Ti1-xFexO2 (x = 0 ~ 0.050) were prepared by sol-gel method. The samples were annealed at 500 ℃ under argon atmosphere and characterized by differential thermal / thermogravimetric analysis TG-DTA), X-ray diffraction (XRD) and Raman spectroscopy were used to analyze the structure and phase transition temperature of the nanoparticles. The magnetic properties of the samples were tested using a vibrating sample magnetometer (VSM). The results show that the samples are anatase after annealed at 500 ℃ under argon atmosphere, and the grain size decreases with the increase of doping amount. VSM test results show that the sample in the central region showed obvious hysteresis.