核壳结构复合纳米颗粒的制备及磁性能毕业论文.docVIP

河 北 工 业 大 学 毕 业 论 文 作 者： 张凤祥 学 号： 101954 学 院： 材料科学与工程学院 系(专业)： 材料物理（功能材料方向） 题 目： Sm-Co@Fe-Co核壳结构复合纳米颗粒的制备 及磁性能 (姓 名) (专业技术职务) 评阅者： (姓 名) (专业技术职务) 2014年5月29日 毕业设计（论文）中文摘要 题 目：Sm-Co@Fe-Co核壳结构复合纳米颗粒的制备及磁性能 摘要： 硬软材料高的矫顽力高的饱和磁化强度交换耦合获得更综合磁性能。本热合成法制备具有核壳结构的Sm-Co@Fe-Co纳米颗粒，工艺参数对颗粒微观结构及磁性能的影响。研究发现，。 核壳结构纳米颗粒 磁性能热法 毕业设计（论文）外文摘要 Title Research on the Preparation and Magnetic Properties of Sm-Co@Fe-Co Magnetic Nanoparticles with a Core-Shell Microstructure Abstract In order to obtain the magnetic materials with more excellent integrated magnetic performance, the method of exchange coupling between hard and soft magnetic phases has been used to integrate the characteristics of these two phases, resulting in both the high saturation magnetization and high coercivity. In this thesis, Sm-Co@Fe-Co magnetic nanoparticles with a core-shell microstructure were prepared by the hydrothermal synthesis method. The microstructure and magnetic properties of Sm-Co@Fe-Co magnetic nanoparticles with a core-shell microstructure were analysed by TEM, XRD and VSM. The influences of technological parameters, such as ratio of raw materials and the heat preservation time, etc, on the microstructure and magnetic properties of nanoparticles were studied. The results show that the Co2+ were reduced to relatively pure Co particles by hydrazine hydrate. As the extension of time Co particles grew up obviously and the properties of coating were deteriorate along with the growing of particles. The Fe2+ all turned to Fe3O4 after the reaction, the Fe3+ can produce a little pure Fe particles, but the quantity is too little to have a significant influence on the magnetic properties. The Fe3O4 can also cover the Sm-Co magnetic nanoparticles to improve their