低温固相反应法制备CoFe_2O_4纳米颗粒  

Solid State Synthesis of CoFe_2O_4 Nanoparticles at Low Heating Temperatures

作　　者：黄磊[1] 王海波[1] 王建波[1] 刘青芳[1] 王伟伟[1] 

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

出　　处：《甘肃科学学报》2009年第3期74-77,共4页Journal of Gansu Sciences

基　　金：教育部新世纪人才支持计划项目(NCET);国家基础科学人才培养基金项目

摘　　要：采用低温固相反应法以CoCl2、FeCl3和NaOH为原料制备了CoFe2O4铁氧体纳米粉体.采用X射线衍射仪(XRD)扫描电子显微镜(SEM)振动样品磁强计(VSM)对样品的成分、形貌和宏观磁性进行了表征,利用等加速穆斯堡尔谱仪对样品进行了穆斯堡尔谱的测量.结果表明,使用本方法可以在较低的温度下(90℃)方便地得到纯度较高,颗粒度(11～56 nm)分布较均匀的CoFe2O4纳米颗粒.用这种方法制备的CoFe2O4粉体单畴临界尺寸在23 nm左右.超精细场随着退火温度的升高而增大.CoFe2O4 ferrite nanoparticles were synthesized by a method of solid state synthesis at low tem- peratures using COCl2, FeCl3, NaOH as the materials. The structure, morphology, magnetic performance are characterized by a X-ray diffraction instrument （XRD）, a scanning electron microscope（SEM）as well as a vibrating sample magnetometer（VSM）. Mossbauer spectroscopy was used to analyse the samples. The results show that high purity of CoFe2O4 particles with the size distribution in the range from 11 to 56 nm can be obtained at low temperature （90℃）. The single domain critical size is about 23 nm . Mossbauer spectra indicate that the hyperfine field of the samples increases as the annealing temperature rises.

关 键 词：低温固相 钴铁氧体纳米颗粒 穆斯堡尓谱 

分 类 号：TM277.1[一般工业技术—材料科学与工程] O481.4[电气工程—电工理论与新技术]