采用分析纯CoCl2·6H2O、ZnCl2·6H2O、FeCl3·6H2O和NaOH为主要原料,控制反应物摩尔比,利用低温固相反应法制备了尖晶石型CoFe2O4、ZnFe2O4和Co0.5Zn0.5Fe2O4纳米粒子.采用X射线衍射、透射电子显微镜对样品的结构、形貌进行表征.在室温下采用振动样品磁强计对其磁性能进行了测定.结果表明:反尖晶石型CoFe2O4纳米粒子的饱和磁化强度为64.28A·m2/kg,呈亚铁磁性;正尖晶石型ZnFe2O4纳米粒子的饱和磁化强度为7.27A·m2/kg,表现出与块体的反铁磁性不同的超顺磁性;而Zn2+替代反尖晶石型CoFe2O4中的一部分磁性离子Co2+形成的复合铁氧体Co0.5Zn0.5Fe2O4的饱和磁化强度为35.06A·m2/kg,呈亚铁磁性.最后,对3种铁氧体的磁性来源进行了探究.
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