共沉淀制备不同粒径Fe_3O_4纳米颗粒及磁性能的研究  

Synthesis of Fe_3O_4 nanoparticles with various sizes and magnetic properties by coprecipitation

作　　者：邵晓萍[1] 代波[1] 马拥军[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010

出　　处：《功能材料》2011年第1期178-181,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(10704061);四川省青年基金资助项目(09ZQ026-002)

摘　　要：以氯化铁(FeCl3.6H2O)和氯化亚铁(FeCl2.4H2O)为原料,氢氧化钠(NaOH)为沉淀剂,在无表面活性剂作用下共沉淀制备出了不同粒径的Fe3O4纳米颗粒。采用X射线衍射(XRD)、透射电子显微镜(TEM)和振动样品磁强计(VSM)对产物的晶体结构、形貌、粒径及磁性能进行了表征。实验结果表明,n(Fe2+)∶n(Fe3+)摩尔比对纳米Fe3O4粒径有重要的影响。在保持铁离子总浓度恒定的情况下,通过调节反应体系中n(Fe2+)∶n(Fe3+)比例可以有效调控纳米Fe3O4的粒径及磁性能。n(Fe2+)∶n(Fe3+)从1∶2增大到6∶1时,Fe3O4的平均粒径从10nm增加到20nm,饱和磁化强度和矫顽力也随之增大。Nanoparticles of Fe3O4 with various sizes were synthesized from FeCl3·6H2O,FeCl2·4H2O and NaOH without use of surfactant by coprecipitation process.The phase structures,morphology,particle size and magnetic property of the products were characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM） and vibrating sample magnetometer（VSM）.It was found that the molar ratio of ferrous to ferric played an important role in the formation Fe3O4 nanoparticles.The mean diameter and magnetic property of Fe3O4 nanoparticles could be controlled by adjusting this ratio.The mean diameter of Fe3O4 nanoparticles swelled from about 10 to 20nm with the molar ratio of ferrous to ferric ferrous ions from 1∶2 to 6∶1.The saturation magnetization and the coercivity also increased correspondingly.

关 键 词：纳米FE3O4粒子 共沉淀 粒径控制 磁性能 

分 类 号：O614.811[理学—无机化学]