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。

Fe-doped TiO2 diluted magnetic semiconductor nanoparticles were prepared by sol-gel method, and were annealed in air under different temperatures. The crystal structure and the phase transition temperature of the nanoparticles were analyzed by thermogravimetry-differential thermal analysis (TG-DTA) and X-ray diffraction (XRD) patterns. It is found that anatase structure exists under lower annealing temperature. A small quantity of rutile phase appears when the temperature was 600℃, and rutile has become the dominant component when the annealing temperature reaches 700℃. The magnetic properties of the nanoparticles were measured by vibrating sample magnetometer(VSM). Room temperature ferromagnetic Ti0.95Fe0.05O2 nanoparticles were successfully obtained after annealed at 450℃, 500℃, 700℃.