针对Fe3O4尺寸均匀性及粒径可控性难题, 采用反向共沉淀法制备了磁性纳米Fe3O4。应用透射电子显微镜(TEM)、X射线衍射仪(XRD)和振动式样品磁强计(VSM)对合成的磁性纳米Fe3O4的形貌、结构、粒径及磁性能进行了表征。结果表明: 反向共沉淀法合成的样品近似球形, 物相分析为尖晶石结构的Fe3O4; 与正向共沉淀法相比, 该方法合成的粒子粒径小, 且粒径分布均匀; 反向法合成的样品室温下无剩磁和矫顽力, 具有超顺磁性；纳米粒子随反应温度升高, 粒径尺寸增大; 随反应溶液pH值增大, 粒径尺寸减小。
The morphology, structure and magnetic property of the nano–Fe3O4 particles synthesized by a reverse coprecipitation method were characterized by using transmission electron microscope (TEM), X–ray diffraction (XRD) and vibrating sample magnetometer (VSM). The results show that nearly spherical Fe3O4 nanoparticles with a spinel structure were obtained which exhibited superparamagnetic behavior at room temperature. The nanoparticles was smaller and more uniform compared with those by the normal coprecipitation method.The size of the nanoparticles increased with the synthesized temperature increasing, and decreased with pH value increasing.
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