Fe_2O_3纳米晶自组装球形颗粒的制备与性能

Preparation and properties of α-Fe_2O_3 nanocrystal self assembling sphere-like particles

以FeCl3,C2H2O4,NaOH为原料,采用水热法200℃反应12 h制备得到了α-Fe2O3纳米晶自组装的球形颗粒。利用X射线衍射仪、扫描电镜和透射电镜对所得产物进行了表征分析,并在室温下测量了其磁学性能。结果表明,所制备的α-Fe2O3纳米晶自组装的球形颗粒为三方晶系的单晶结构,其平均尺寸为300 nm。在室温下测试了球形颗粒的磁学特性,其矫顽力和剩余磁化强度分别为1543.34 Oe和0.10 emu/g,并根据α-Fe2O3纳米晶的形成与组装过程中的作用,并提出了可能生长机理。

α-Fe2O3 nanocrystal self assembling sphere-like particles had been successfully prepared by hydrothermal synthesis route using FeCl3 , C2H2O4, NaOH as reagents reacting at 200 ℃ for 12 h. Morphology and structure of the products were characterized by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results show that theα-Fe2O3 nanocrystal self assembling sphere-like particles are single-crystalline rhombohedral structure and the average diameter of the particles is about 300 nm. Magnetic properties of the α-Fe2O3 nanocrystal were detected by a vibrating sample magnetometer at room temperature. The sphere-like particles exhibit a ferromagnetic behavior with the coercive force （Ho） and remanent magnetization （Mr） are 1543.34 Oe and 0. 10 emu/ g, respectively. Furthermore, the mechanism for the formation of the urchin-like nanostructure is preliminarily discussed.