钴铁氧体纳米粒子制备及其镧掺杂的磁性能研究  

Synthesis of cobalt ferrite nanoparticles and effect of doped lanthanum on magnetic properties of cobalt ferrite

作　　者：段红珍[1,2] 李巧玲[2] 蔺向阳[1] 李凤生[1] 

机构地区：[1]南京理工大学化工学院,南京210094 [2]中北大学理学院化学系,太原030051

出　　处：《材料科学与工艺》2009年第1期88-91,共4页Materials Science and Technology

基　　金：国家自然科学基金资助项目(50602024,20571066);中国人民总装备部预先研究基金(41328030507)

摘　　要：为了制备性能良好的钴铁氧体及改善其磁性能,通过改进的溶胶凝胶自蔓延燃烧法成功地制备了钴铁氧体(CoFe2O4)及掺镧(La)钴铁氧体纳米粒子.采用X射线衍射(XRD),透射电镜(TEM)、能谱分析(EDS)、振动样品磁场计(VSM)对所得粒子进行了结构、形貌、成分及磁性能表征.测试结果表明,利用改进的溶胶凝胶法制得钴铁氧体粒度均匀,且成相温度较低,500℃煅烧1h时平均粒径12nm左右;通过掺杂稀土镧元素对所得铁氧体的相结构有较强的影响,所得掺镧钴铁氧体与目标产物一致;所得钴铁氧体具有较高的矫顽力(737.33Oe),并且通过稀土元素镧的掺杂提高了钴铁氧体的矫顽力.In order to prepare the cobalt ferrite which has excellent properties and improve its magnetic properties ,the cobalt ferrite（ CoFe2O4 ） and doped lanthanum（La） cobalt ferrite nanoparticles were synthesized by the self-propagation combustion of material made by modified sol-gel method. The properties of the particles were characterized using various techniques, such as X-ray diffraction （XRD） , transmission electron microscope （TEM） , energy dispersive X-ray spectrometer （EDS） and vibrating sample magnetometer （VSM）. Measurement results show that the nanoparticles calcined at different temperatures have different crystallization. The mean particles＇ size of cobalt ferrite samples by self-propagation combustion calcined at 500 ℃for 1 h is 12 nm and homogenous. The phase of cobalt ferrite is influenced through doping metal La. The magnetic measurements indicate that synthesized cobalt ferrite nanoparticles have high coercive force of 737.33 Oe, and the coercive force of cobalt ferrite is enhanced through doping rare earth metal La.

关 键 词：钴铁氧体 纳米粒子 镧 溶胶凝胶 矫顽力 

分 类 号：O614.8[理学—无机化学]