共沉淀法制备CoFe_2O_4纳米颗粒及其磁电性能表征  

Magnetic and electric properties characterization of cobalt ferrite nanoparticles synthesized by coprecipitation method

作　　者：程振宇[1] 代建清[1] 王志翔[1] 朱建辉 徐接旺 CHENG Zhenyu;DAI Jianqing;WANG Zliixiang;ZHU Jianhui;XU Jiewang(School of Material Science and Engineering9 Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093

出　　处：《功能材料》2017年第8期102-106,112,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51462019)

摘　　要：通过热力学计算确定Me-NaOH-NH_3·H_2O体系中钴离子和铁离子的最佳共沉淀pH值,然后采用化学共沉淀法制备了CoFe_2O_4的前驱体粉体,再经过热处理制得纯相CoFe_2O_4粉体,并用X射线衍射仪、扫描电镜、振动样品磁强计和精密阻抗分析仪对其进行表征。结果表明,在pH值=11.4的的共沉淀条件下制备得到前驱体粉体,经400℃煅烧就已经开始形成CoFe_2O_4粉体,温度继续升高生成纯相粉体;并且样品的饱和磁化强度Ms、剩磁Mr及矫顽力Hc随温度升高先增大后减小,在500℃(接近居里温度点)附近达到最大值分别为Ms=14.40A·m^2/kg,Mr=3.15A·m^2/kg,Hc=3.22kA/m,与以往研究报道不同。The most appropriate pH value for Co2+and Fe3+to precipitate in the Me-Na(_)H-NH3.H2(3system was calculated by thermodynamic calculation,then the precursor of CoFe2〇4was synthesized by coprecipitation method.After that,the pure CoFe2〇4powders were obtained from the precursor through the heat treatment.X-ray diffractometer,scanning electron microscope,vibrating sample magnetometer and precision impedance analyzer were employed to characterize the samples.The results show that the precursor synthesized under the coprecipitation condition of pH,14begins to form the CoFe2O4powders when calcined at400°C and the pow-ders become purer with the increase of temperatures.The saturation magnetization,residual magnetization and coercivity increase first and then decrease with the rise of temperature and reach the maximum value of14.40,3.15A.m2/kg and3.22kA/m at500°C,which is close to the Curie temperature.The results are different from the previous reports of surveys.

关 键 词：铁酸钴 磁滞回线 共沉淀法 热处理温度 磁电性能 

分 类 号：TB34[一般工业技术—材料科学与工程] 0482