在140～180℃利用水热合成法制备了CoFe2O4纳米颗粒.使用X射线衍射仪和振动磁强计检测CoFe2O4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CoFe2O4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.
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