Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第11期    总第68期    2004年11月

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文章编号: 1004-609(2004)11-1901-5
NiFe2O4/SiO2纳米复合体的制备及其磁性能
黄祥卉, 陈振华

( 湖南大学 材料科学与工程学院, 长沙 410082)

摘 要: 通过溶胶凝胶法将NiFe2O4纳米颗粒分散于SiO2基体中, 制得NiFe2O4/SiO2纳米复合体。 利用XRD, DSC, TEM和VSM对合成的(NiFe2O4)wSiO2(1-w)(5%≤w≤55%)纳米复合体进行了表征。 研究结果显示: w<15%的纳米复合体均以非晶态存在, 在15%≤w≤50%的范围内, 随着w的增加, NiFe2O4的晶粒尺寸从2 nm增长到25 nm, w进一步增加则会导致材料中NiFe2O4晶粒尺寸减小。 所制备的NiFe2O4/SiO2纳米复合体的饱和磁场强度随晶粒尺寸增加而增加, 变化范围为3.7~11.0 A·m2·kg-1; 矫顽力值最大可以达到2.49×104 A·m-1, 是纯NiFe2O4大块材料矫顽力值的4倍以上。

 

关键字: 纳米复合体; 溶胶凝胶法; 镍铁氧体; 二氧化硅基; 磁性能

Synthesis and magnetic properties of
nickel ferrite on silica nanocomposites
HUANG Xiang-hui, CHEN Zhen-hua

College of Materials Science and Engineering, 
Hunan University, Changsha 410082, China

Abstract: Nanocomposites with nickel ferrite nanoparticles uniformly dispersed in silica matrix were successfully synthesized by sol-gel process. The obtained (NiFe2O4)wSiO2(1-w)(5%≤w≤55%) samples were investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), transmission electron microscope (TEM) and vibration sample magnetometer (VSM). The results show that as w≤15%, the materials have an amorphous character, at the range of 15%≤w≤50%, the crystalline sizes increase ranging from 2 nm to 25 nm with increasing w, while at higher concentrations, a decrease in the crystalline sizes is observed. Ms increases with the crystalline size, ranging in 3.7-11.0 A·m2·kg-1 and coercivity can be as high as 2.49×104 A·m-1, which is more than four times higher than the coercivity of bulk nickel ferrite. 

 

Key words: nanocomposites; sol-gel method; NiFe2O4; SiO2 matrix; magnetic properties

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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