低温固相反应法制备NiFe_2O_4纳米粉体  

Solid State Synthesis of NiFe_2O_4 Nanoparticles at Low Temperature

作　　者：田庚方[1] 王丽[1] 王海波[1] 李发伸[1] 

机构地区：[1]兰州大学教育部磁学与磁性材料重点实验室,甘肃兰州730000

出　　处：《磁性材料及器件》2005年第4期20-21,37,共3页Journal of Magnetic Materials and Devices

摘　　要：采用低温固相反应法制备了NiFe2O4铁氧体纳米粉体.用X射线衍射、振动样品磁强计及穆斯堡尔谱仪对样品进行了分析与观测.结果表明,该方法可以方便地得到纯度较高、粒径在9~35 nm之间、粒度分布均匀的尖晶石结构的NiFe2O4粉体.随着焙烧温度的提高相结构趋于完整,晶粒尺寸增大.随着晶粒尺寸的增大,样品饱和磁化强度随之增大,向块体逼近;平均超精细场也随之增大,穆谱数据还显示了样品的超顺磁转变尺寸为9 nm左右.NiFe2O4 nanoparticles were synthesized by the method of solid state synthesis at room temperatures. X-ray diffraction （XRD）. vibrating sample magnetometer（VSM） and Moessbauer spectroscopy were used to analysize and measure the samples, It was shown that NiFe2O4 nanoparticles in the range of 9-35nm with high purity and narrow size distribution were produced by this method. The particle size increases with the increase of annealing temperature, The measurement of VSM claims the dependence of saturation magnetization on the particle size. Moessbauer spectroscopy indicates the hyperfine field of the samples decrease as the particle size decreases, The critical size for superparamagnetic transition is about 9 nm.

关 键 词：低温固相反应法 镍铁氧体纳米颗粒 微结构 磁性能 

分 类 号：TM277.1[一般工业技术—材料科学与工程]