纳米晶CoFe2-xCexO4的结构与磁性能研究

采用化学共沉法制备了纳米尺度的CoFe2-xCexO4（x=0～0．3）粉料，分别在不同温度下进行了热处理，利用X射线衍射仪（XRD）、振动样品磁强计（VSM）对样品的结构和磁性进行了测量和分析．实验结果表明：在铈掺杂量x≤0．2时样品形成了单一的具有尖晶石结构的钴铁氧体相，而x〉0．2时钴铁氧体相和CeO2相并存；铈掺杂量对样品的磁性能有较强的影响，在铈含量较低（x≤0．2）时，比饱和磁化强度σs变化不大，矫顽力Hc大幅度增大，而在x〉0．2之后二者都急剧下降，在x=0．1附近样品能同时获得较大的Hc和σs值．

On the structure and magnetic properties of nanocrystalline CoFe2-xCexO4

A series of nanocrystalline CoFe2-xCexO4 （x= 0-0.3） powders were prepared by chemical coprecipitation technique and annealed at different temperature in air. The structure and magnetic properties of the samples were studied by using X-ray diffraction （XRD） and vibrating sample magnetometer （VSM）. The experimental results showed that monophase cobalt ferrite CoFe2-xCexO4 with spinel structure was formed with the doping content of cerium x≤0.2, and CoFe2-xCexO4 phase and CeO2 phase coexisted with x〉0.2. The doping content of cerium had a heavily influence on the magnetic properties of the samples. With lower doping content of cerium （x≤0.2） the specific saturation magnetization as changed little, but the coercivity Hc increased substantially, while both as and Hc decreased sharply with x〉0.2. Higher as and Hc were obtained simultaneously with x=0.1 approximately.