α-Fe_2O_3纳米晶自组装磁性微球的制备及性能研究

Preparation and Properties of Iron Oxide Magnetic Microspheres

以硝酸铁（Fe（NO3）3·9H2O）和氨水（NH3·H2O）为原料,以聚乙烯吡咯烷酮（PVP）为表面活性剂,采用沉淀法制备了α-Fe2O3纳米晶自组装的磁性微球。利用X射线衍射仪和扫描电镜对所得产物进行了表征分析,并在室温下测量其磁学性能。结果表明,所制备的磁性微球由α-Fe2O3纳米晶自组装而成,其粒径大小在0.9-1.3μm范围。在室温下测试了微球的磁学性能,其剩余磁感应强度为0.31 emu/g,矫顽力为4100 Oe,表现出较强的铁磁性。

α-Fe2O3 nanocrystal self assembling sphere-like particles had been successfully prepared by homogenous precipitation method using Fe（ NO3）3·9H2O and NH3·H2O as main raw materials.Morphology and structure of the products were characterized by X-ray diffraction,and scanning electron microscopy. The results show that the magnetic microspheres were self-assembled byα-Fe2O3 nanocrystal,and the average diameter of the microsphere is about 0. 9-1. 3 μm. The microsphere exhibits a ferromagnetic behavior with the remanent magnetization（ Mr） and coercive force（ Hc） are 0.31 emu/g and 4100 Oe,respectively.