Synthesis,Microstructure and Magnetic Properties of Nanocrystalline Ni-Zn Ferrite by a Modified Wet Chemical Method
Nanocrystalline Ni1-xZnxFe2O4 ferrites with 0 ≤ x ≤ 1 were prepared by spraying-coprecipitation method.The microstructure was investigated by TG-DSC,XRD,SEM,TEM and BET.Magnetic properties were measured with vibrating sample magnetometer at room temperature.The results showed that uniform and fine nanocrystalline Ni1-xZnxFe2O4 ferrites are obtained.The grain size of sample calcined at 600℃ for 1.5h is about 30nm.There are a few agglomerates with average sizes below 100nm.The specific saturation magnetization,Ms,of the sample increases with increasing Zn2+ concent x at room temperature,and the maximum Ms is 66.8 A·m2·kg-1 as the Zn2+ content x is around 0.5mol.As calcining temperature increased from 400℃ to 1050℃,the Ms of Ni0.5Zn0.5Fe2O4 ferrite increases from 40.2 A·m2·kg-1 to 75.6 A·m2·kg-1.The coercivity maximum is about 5.97 kA·m-1 as its critical grain size is about 62.0nm.The relation between coercivity and grain size for nanocrystalline Ni0.5Zn0.5Fe2O4 ferrite may be explained based on random anisotropy theory.
Nanocrystalline material Ni-Zn ferrite Magnetic properties Random anisotropy
Yin Liu Tai Qiu
College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China;D College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China
国际会议
The Fifth China International Conference on High-Performance Ceramics (第五届先进陶瓷国际研讨会(CICC-5))
长沙
英文
594-597
2007-05-10（万方平台首次上网日期，不代表论文的发表时间）