摘要
铁氧体具有优良的磁性能,是一种应用广泛的功能材料。采用化学共沉淀法制备了纳米Fe_3O_4颗粒,选用氨水作为沉淀剂,将其加入到Fe^(2+)和Fe^(3+)的混合溶液中。探讨了温度、pH值以及Fe^(2+)/Fe^(3+)物质的量比对颗粒粒径、形貌和磁性能的影响。采用TEM、XRD、VSM和IR对颗粒的结构和性能进行了表征。结果表明,在没有惰性气体保护下为了避免高温氧化,通过增加Fe^(2+)用量和沉淀剂用量,可在较低温度下生成颗粒大小均匀、磁性能好的Fe_3O_4颗粒,饱和磁化强度达到91.37emu/g。
Nano magnetite is a kind of magnetic materials of many functions. Fe3O4 magnetic nanoparticles are synthesized by the chemical co-precipitation method which precipitation NH4OH is added into the mix liquid of Fe2＋ and Fe3＋ in this paper. The influence of temperature, pH value and moler-ratio of Fe2＋ and Fe3＋ on the particles＇ structure and magnetic features are discussed. TEM, XRD, VSM and IR are employed to characterize the properties of prepared Fe3O4 magnetic nanoparticles. The conclusion can be made that the Fe3O4 nanoparticles which have better crys- tallinity, smaller size and higher saturation magnetization intensity can he synthesized under low temperature by adding excessive Fe2＋ and precipitation, and its maximal saturation magnetization intensity reaches 91.37emu/g.
关键词
FE3O4纳米颗粒
化学共沉淀法
磁化强度
Fe3O4 nanoparticles, chemical copreeipitation, magnetization intensity
