制备参数对溶胶-凝胶自蔓延燃烧法制备纳米钴铁氧体的影响  

CoFe_2O_4 nanocrystal ferrite prepared by sol-gel auto-combustion method: effects of preparation parameters

作　　者：汪海艳[1,2] 蔡晓东[1,2] 张乾平 童金辉[1,2] 

机构地区：[1]西北师范大学生态环境相关高分子材料教育部重点实验室,甘肃兰州730070 [2]西北师范大学甘肃省高分子材料重点实验室化学化工学院,甘肃兰州730070

出　　处：《磁性材料及器件》2014年第2期9-13,共5页Journal of Magnetic Materials and Devices

基　　金：国家杰出青年基金资助项目(20625308);西北师范大学青年教师科研能力提升计划项目(NWNU-LKQN-10-28)

摘　　要：在不同金属离子浓度（0.1-0.3mol/L）和pH值（〈1～10）下，通过简单的溶胶-凝胶自蔓延燃烧法合成了六种尖晶石型CoFe2O4纳米粒子，采用X射线粉末衍射（XRD）、傅里叶变换红外光谱（FT-IR）、透射电镜（TEM）、N2吸脱附等手段对所得样品进行了表征，并采用振动样品磁强计（VSM）对样品的磁学性质进行了表征。结果表明，前驱体溶液的pH值及金属离子浓度对CoFe2O4纳米晶体的粒径、形貌及磁性均有影响。溶液pH值越高，金属离子浓度越大，所得产物的粒径也越大。样品的比饱和磁化强度随前驱体溶液pH值的升高而减小。Six magnetic nanocrystalline spinel-type ferrite CoFe2O4 samples were prepared by simple sol-gel auto-combustion method from precursor solutions with different metal concentrations （0.1-0.3 mol/L） and various pH values （〈1-10）. The samples were characterized by X-ray diffractometry （XRD）, Fourier transform infrared spectrophotometry （FT-IR）, N2 physisorption and transmission electron microscopy （TEM）. Their magnetic properties were characterized by vibrating sample magnetometer （VSM） at room temperature. The results show that pH value and metal concentration of the precursor solution play important roles in the size, dispersion and morphology of the as-prepared CoFe2O4 nanocrystal, and thus in its magnetic property. The particle sizes of the samples increase with increasing pH value and metal concentration of the solutions, while the saturation magnetization values of the samples decrease with increasing pH values of the precursor solutions.

关 键 词：纳米CoFe2O4 溶胶-凝胶自蔓延燃烧法 PH值 金属离子浓度 磁性能 NANOCRYSTALLINE COFE2O4 

分 类 号：TB383[一般工业技术—材料科学与工程] TM277[电气工程—电工理论与新技术]