球磨时间对制备Fe-ZnO核壳纳米复合粒子的结构和性能的影响

通过高能球磨法制备了具有蛋糕-果仁形态的Fe-ZnO核壳纳米复合粒子,并研究了形成产物的微观结构、演化过程以及静磁性能和2-18GHz微波电磁参数.研究结果表明Fe-ZnO粒子具有良好的抗氧化性.XRD、HRTEM和SEM显示,随球磨进行Fe-ZnO粒子中Fe晶粒尺寸减小到10nm左右并逐渐增加表面各向异性.与微米羰基铁相比,Fe-ZnO粒子具有较大的微波磁导率和较小的微波介电常数,以及相近的比饱和磁化强度.本文发展的方法对制备其他金属与无机氧化物的纳米复合材料也有重要指导作用.

Influence of Ball Milling Time on the Microstructure and Properties of Prepared Fe-ZnO Core-shell Nanocomposite Particles

The Fe-ZnO core-shell nanocomposite particles with " currant-bun " morphology were prepared from the mixture of iron carboxyl and ZnO powders by the ball milling method and were characterized by SEM, XRD, HRTEM and TG-DSC. The magnetic properties and the microwave electromagnetic parameters of the particles were measured. The results show Fe-ZnO particles have excellent antioxidation property. Data of XRD, HRTEM and SEM suggest grain sizes of Fe nanocrystals diminish to about 10nm during ball milling and the anisotropy of their surfaces enhance contrarily. The permittivity of Fe-ZnO particles is lower than that of micron iron carboxyl, but permeability is evidently higher, and specific saturation magnetization is approximate to that of micron iron carboxyl. The method provides a new route to synthesize other metal-oxide core-shell nanocomposite particles.