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中文摘要：
通过改变碱浓度和表面活性剂种类,采用水热法在0～7mol/LNaOH的宽碱浓度下制备出纯相铁酸镍（NiFe2O4）纳米晶体。利用X射线衍射（XRD）、透射电子显微镜（TEM）、高分辨率透射电子显微镜（HRTEM）、红外光谱和振动样品磁强计（VSM）对制备的粉体进行结构和磁性表征。结果表明：制备的NiFe2O4晶体随着碱浓度增大,晶粒尺寸先增大后减小,形状由圆形逐渐变成方形,饱和磁化强度也出现相应的变化,所得磁性粉末具有较高的饱和磁化强度和较低的矫顽力。
英文摘要：
Pure NiFe2O4 nanocrystallines were synthesized by hydrothermal method under 0-7 mol/L alkali concentration and different surfactant. The structure and magnetism of powder were characterized by X-ray diffractometer,transmission electron microscope,Fourier transform infrared spectrometer and vibrating sample magnetometer. The crystal size of NiFe2O4 powder increases firstly and then decreases as alkali concentration increasing. Relatively,the circular NiFe2O4 crystallines become square crystallines. The samples have high saturation magnetization relative to the crystal size and low coercivity.
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