微乳液体系制备Fe_2B包覆纳米α-Fe及其性能研究

Synthesis of Fe2B coated iron nanoparticles in microemulsion system and characterization

采用油包水（W／O）的微乳液体系制备纳米α-Fe。XRD、TEM分析表明，纳米α-Fe被Fe2B所包覆，其粒度在20～100nm；激光粒度分析表明，纳米α-Fe存在团聚现象，但粒度分布窄；TG-DSC分析表明，纳米α-Fe在1100K时发生吸热的α-γ相变；磁强计检测表明，粉体具有铁磁性，其饱和磁化强度为1．14emu／g，剩余磁化强度为0．08emu／g，矫顽力为280Oe。

The Fe2B coated iron nanoparticles （α-Fe） in W/O microemulsion system was synthesized. XRD and TEM illustrated Fe2B coated on the surface of iron nanoparticles and the particle size was about 20～100nm with a variable degree of aggregation. Laser diffraction granularity （LI）G） showed iron nanoparticles were inclined to aggregation but with narrow size distribution. Simultaneous thermal analysis （DSC-TG） showed α-Fe nanoparticles decalescenced and transformed to γ-Fe when the temperature 〉 l100K. Additionally, iron nanoparticles are ferromagnetic, the saturation magnetization （Ms）, remnant magnetization （Mr） and coercivity （Hc） are 1.14emu/g, 0.08emu/g and 280Oe, respectively.