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在140~180℃利用水热合成法制备了Co Fe2O4纳米颗粒。使用X射线衍射仪和振动磁强计检测Co Fe2O4纳米颗粒。结果表明:随着合成温度的升高,该颗粒的矫顽力先增大后减小,在160℃时出现峰值,晶粒尺寸和饱和磁化强度则持续增加。对上述Co Fe2O4纳米颗粒进行磁分离处理,结果表明:该颗粒的晶粒尺寸和矫顽力都有一定程度的提高,其中原产物晶粒尺寸越小,晶粒尺寸和矫顽力提高的效果越明显。说明磁分离可以去除样品中的超顺磁颗粒,减小样品的晶粒尺寸分布,提高样品的矫顽力。
Co Fe2O4 nanoparticles were prepared by hydrothermal synthesis at 140 ~ 180 ℃. Co Fe2O4 nanoparticles were detected using an X-ray diffractometer and a vibrating magnetometer. The results show that with the increase of the synthesis temperature, the coercive force of the particles first increases and then decreases, and reaches the peak at 160 ℃. The grain size and saturation magnetization increase continuously. The magnetic separation of the above CoFe2O4 nanoparticles showed that the grain size and the coercive force of the particles increased to some extent. The smaller the original grain size, the larger the grain size and the coercive force The more obvious. Magnetic separation can remove the superparamagnetic particles in the sample, reduce the grain size distribution of the sample and improve the coercivity of the sample.