氧化铁磁性微球的合成及磁学性能研究

Study on the synthesis and magnetic properties of iron oxide magnetic microspheres

以氯化铁(FeCl_3·6H_2O)和氨水(NH_3·H_2O)为原料,以十六烷基三甲基溴化铵(CTAB)为表面活性剂,采用共沉淀法制备了氧化铁磁性微球。利用X射线衍射(XRD)、扫描电镜(SEM)和磁性测量系统(SQUID-VSM)对样品成分、形貌和磁学性能进行了表征分析。结果表明:所得氧化铁磁性微球为类球形斜方六面体结构,其粒径大小在0.8-1.0um左右,剩余磁感应强度为0.13emu/g,矫顽力为1960Oe,表现出一定的铁磁性。

In this paper,the hematite(Fe_2O_3) microspheres were synthesized by coprecipitation method,in which FeCl_3 ? 6H_2O and NH_3 ? H_2O were as the main raw material,and Hexadecyl trimethyl ammonium Bromide(CTAB) as surfactant.The components,morphology and magnetic property of the sample were investigated by X-ray diffraction analysis(XRD),scanning electron midroscope(SEM) and magnetic measurement system(SQUID-VSM).The results show that:the iron oxide magnetic microspheres were spherical rhombohedral structure with the average diameter of 0.8-1.0um,the remanent magnetization(M_r) of 0.09 emu/g and the coercivity(H_c) of 12000e,respectively,exhibited a weak ferromagnetic.