以十六烷基三甲基溴化铵(CTAB)为模板,Fe(NO_3)_3·9H_2O和Co(NO_3)_2·6H_2O为原料,NaOH为沉淀剂,低温回流合成了磁性铁酸钴纳米晶. 利用X射线衍射、透射电子显微镜、红外光谱、拉曼光谱等测试技术对产品的结构进行了表征,借助振动样品磁强计测定了样品的室温磁性能. 结果表明,铁酸钴纳米晶为单相立方尖晶石结构,纳米晶的平均粒径为15～20 nm. 铁酸钴纳米晶在室温外加磁场下表现出明显的磁滞现象,饱和比磁化强度M_S=36.5 A·m~2/kg,矫顽力HC=5.89×104 A/m.
CoFe_2O_4 nanocrystals were prepared by means of a low temperature refluxing method with CTAB as templet, Fe(NO_3)_3·9H_2O and Co(NO_3)2·6H_2O as precursors, NaOH as precipitator. The as-prepared products were characterized by X-ray diffraction, transmission electron microscopy, infrared and Raman spectroscopies. The room temperature magnetic properties were determined by means of vibrating sample magnetometer. The results show that CoFe_2O_4 has a single-phase spinel structure. The average particle size was in a range of 15～20 nm. CoFe_2O_4 exhibited a clearly magnetic hysteretic behavior under applied magnetic field at room temperature. The values of variation of saturation magnetization(Ms) and coercivity(HC) were 36.5 A·m~2/kg and 5.89×10~4 A/m, respectively.
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