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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。
Analytical pure CoCl2.6H2O, ZnCl2.6H2O, FeCl3.6H2O and NaOH were used as the main raw materials to control the molar ratio of the reactants. The spinel-type CoFe2O4, ZnFe2O4 and Co0.5Zn0.5Fe2O4 nanoparticles were prepared by low temperature solid-state reaction. The structure and morphology of the samples were characterized by X-ray diffraction and transmission electron microscopy. Its magnetic properties were measured at room temperature using a vibrating sample magnetometer. The results show that the saturation magnetization of anti-spinel CoFe2O4nanoparticles is 64.28A · m2 / kg, which is ferrimagnetism. The saturation magnetization of the positive spinel ZnFe2O4nanoparticles is 7.27A.m2 / kg, And the antiferromagnetic bulk superparamagnetic; and the saturation magnetization of composite ferrite Co0.5Zn0.5Fe2O4 formed by Zn2 + instead of part of the magnetic ions Co2 + in the anti-spinel-type CoFe2O4 is 35.06A · m2 / kg Ferrous magnetic. Finally, the magnetic sources of the three ferrites were explored.