采用化学共沉淀法,在各种合成温度下,制备了不同粒径尺寸的CoFe2O4纳米颗粒,并对100℃合成的样品进行不同温度的热处理.应用XRD、TEM、SEM、穆斯堡尔谱、VSM对样品进行分析.结果表明,随着合成温度和热处理温度的升高,样品的粒径逐渐增大,结晶性逐渐增强；不同平均粒径的样品具有不同的超顺磁性,当平均粒径增大到14.9 nm时,样品超顺磁性消失；随着热处理温度升高,A位Fe3比例逐渐增大,A位和B位的超精细场也逐渐增大；VSM分析表明,样品的饱和磁化强度随着热处理温度的升高而增大.
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