固态铁源湿法制备四氧化三铁磁性微晶及表征

Wet Processes Preparation and Characterization of Magnetic Fe_3O_4 from Solid Iron Sources

分别采用α-Fe和α-Fe_2O_3在强碱性溶液下低温合成Fe_3O_4微晶粉体,所得样品的物相用X射线衍射(XRD)仪表征,形貌通过电子扫描显微镜(SEM)观测,磁性用振动样品磁强计(VSM)测试.在物相表征中都观察到:随着溶液碱性的增强,两种铁源由各自的物相向立方Fe_3O_4相转变的过程.在形貌观测中发现,由两种固态铁源合成出纯相的Fe_3O_4微晶粉体都呈现出良好的正八面体形状.通过磁性测试并比较发现,由Fe合成出Fe_3O_4微晶粉体的饱和磁化强度Ms比由α-Fe_2O_3合成的高,而矫顽力Hc低于后者.

The magnetite （Fe3O4） microcrystal prepared in alkaline solution from iron （α-Fe） and hematite （α-Fe2O3） respectively at low temperature. The chemical compositions of the as-prepared samples were characterized by XRD, their morphologies were observed by SEM, while the magnetic property of the sample was studied by VSM. Structure characterization showed that the phase structure of the prepared particles respectively evolved from α-Fe and hematite （α-Fe2o3） to pure Fe304 with increasing the concentration of alkali. Morphology characterization showed that the pure Fe3O4, which prepared from α-Fe and （α- Fe2O3） respectively, shaped with good octahedrons. Through Magnetic properties comparisons, the Ms of the products prepared from Fe is higher than that of the ones from α-Fe2O3, while the Hc is lower than that of the latter.