高饱和磁化强度Fe_3O_4纳米粒子的制备及表征

The synthesis and characterization of Magnetic Iron Oxide with high saturation magnetization

实验采用反滴定化学共沉淀工艺在无任何惰性气体保护情况下合成了纯度高、结晶性好的四氧化三铁纳米粒子,测试结果显示,其饱和磁化强度高达104.6emu/g。用X射线衍射仪、扫描电镜、选区电子衍射和X射线光电子能谱表征了四氧化三铁纳米粒子的形貌结构及化学成分等性质,用振动磁强计测试其磁性质。详细的讨论了pH值、陈化温度、陈化时间等因素对磁性质的影响机制。

Magnetic iron oxide with high purity and good crystallization has been successfully synthesized via anti-titration co-precipitation method without the protection of any inert gas. The test result shows that the synthesized nanometer particles have saturation magnetization as high as 104.6emu/g.Their characters, such as morphology structure and chemical composition, were indicated by X-ray powder diffraction （XRD）, scanning electron microscope （SEM） and selected area electron diffraction （SAED）, X-ray photoelectron spectroscopy （XPS）, and their magnetic properties were tested by vibrating sample magnetometer （VSM）. The effects of different conditions on the magnetic properties are studied and the possible mechanisms related to the effects are also discussed in this paper.