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采用溶胶-凝胶工艺制备了磁性Fe掺杂TiO2基稀磁半导体的纳米颗粒,在空气氛围中以不同温度对样品进行退火处理。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。研究发现:退火温度450℃和500℃时样品为锐钛矿结构,在600℃时既有锐钛矿相,又有金红石相,当退火温度为700℃时,样品转变成金红石结构。使用振动样品磁场计(VSM)测试样品磁性能,当退火温度为450℃、500℃、700℃时,我们得到了具有室温铁磁性的Ti0.95Fe0.05O2纳米颗粒。
The nanoparticles of magnetic Fe-doped TiO2-based diluted magnetic semiconductors were prepared by sol-gel process and the samples were annealed at different temperatures in air atmosphere. The structure and phase transition temperature of the nanoparticles were analyzed by TG-DTA, XRD and Raman spectroscopy. The results show that the samples are anatase at annealing temperature of 450 ℃ and 500 ℃, both anatase phase and rutile phase at 600 ℃. When the annealing temperature is 700 ℃, the sample is transformed into rutile structure. The magnetic properties of the samples were tested using a vibrating sample magnetometer (VSM). When the annealing temperature was 450 ℃, 500 ℃, 700 ℃, we obtained Ti0.95Fe0.05O2 nanoparticles with room temperature ferromagnetism.