摘要
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 struc- ture and the phase transition temperature of the nanoparticles were analyzed by thermo- gravimetry-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 ruffle 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 Tio. 95 Fe0. 05 O2 nanoparticles were successfully obtained after annealed at 450℃, 500℃, 700C.
出处
《光散射学报》
北大核心
2011年第2期125-128,共4页
The Journal of Light Scattering
