采用溶胶凝胶自燃烧法制备了Mn0.4Zn0.6-xCoxFe2O4铁氧体,研究了钴掺杂对其结构和磁性质的影响.将自燃烧法制备的粉末进行1,150℃烧结.利用X射线衍射仪对制备的粉末测试发现,Mn0.4Zn0.6-xCoxFe2O4系列铁氧体都具有尖晶石结构.利用VSM对铁氧体进行磁性测试,发现饱和磁化强度与晶格常数的变化规律一致,在钴含量为0.2时,都取得最大值.通过μi-T曲线发现,初始磁导率随着钴含量的增加而降低,居里温度是一个常数.而且,钴含量可以调节磁导率的温度稳定性,在钴含量为0.3时,磁导率具有优良的温度稳定性.基于铁氧体中离子分布的原理,阐明了钴掺杂对铁氧体磁导率温度稳定性的作用机理.
Nanocrystalline ferrites Mn0.4Zn0.6-x CoxFe2O4 (x =0.1,0.2,0.3,0.4 ) were prepared by auto-combustion method.The effects of Co substitution on microstructure and magnetic properties are investigated.The ferrite powders were prepared by the selfpropagating combustion synthesis method and subsequently molded and sintered at 1,150 ℃.As-synthesized ferrites powders,characterized by X-ray diffraction (XRD),had demonstrated the phase of spinel structure.The saturated magnetizations of the MnZn ferrite samples,measured by vibrating sample magnetometer (VSM),are varied with the lattice parameters,which reach the maximum values with the Co content of 0.2 in mole.The initial permeability decreases with the increase of Co content.Meanwhile,the Curie temperatures are constant.The temperature dependence of permeability showed that the temperature stability of initial permeability could be adjusted by the Co content and the sample with the Co content of 0.3 has good temperature stability.The corresponding mechanism was clarified based on the metal ion distribution.
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