Fe_3O_4基纳米磁性粉体的调控合成及性能研究

Controlled Synthesis and Properties of Fe_3O_4-based Magnetic Nanoparticles

以水合肼为还原剂,分别以FeSO4·7H2O和NiCl2与FeSO4·7H2O摩尔比1∶2的混合物为原料,采用水热法制备出磁性纳米颗粒。利用XRD、TEM、TG等方法分析对样品结构和形貌进行表征,利用振动样品磁强计(VSM)对产物的磁学性质进行研究。分析结果表明:两种反应产物均具为反尖晶石结构,两种产物表面均结合了柠檬酸根离子,但有镍离子参与的反应所得产物粒径更小。磁性分析表明,由于镍离子的加入而使得产物的饱和磁场强度及矫顽力均有所降低。研究结果表明,可以通过调节反应物的配比实现Fe3O4基纳米磁性粉体的形貌以及磁学性能的调控。

Magentic nanoparticles were prepared by hydrothermal method using hydrazine hydrate as the reductant, FeSO4 ·7H2O and the mixture of NiCl2 and FeSO4·7H2O at the initial molar ratio of 1：2 as reactants, respectively. The structures and morphologies of synthesized samples were characterized by XRD, TEM, TG, and magnetic properties were investigated by VSM. The analysis results showed that both of the two products have anti-spinel structure, and the surfaces of the two products have affinity to with citrate, but the particle size with Ni2＋ is smaller. The magnetic analysis exhibited that both of saturation magnetion and coercive force of the nanoparticles reduced due to addition of Ni2＋ as reactant. The research results revealed that the morphology and magnetic property of Fe3O4-based nanoparticle can be controUed by adjusting the ratio of reactants.