Synthesis and Magnetic Properties of Dy-doped CoFe2O Nanocrystalline Ferrites

被引：0
|
作者：
Ge Hongliang [1 ]
Huang Bao [1 ]
Ke Xin [2 ]
He Wenhao [2 ]
Hong Bo [1 ]
Xu Jincai [1 ]
Wang Xinqing [1 ]
机构：
[1] China Jiliang Univ, Hangzhou 310018, Zhejiang, Peoples R China
[2] Huzhou Keda Magnetoelect Ltd Co, Huzhou 313200, Peoples R China
来源：
RARE METAL MATERIALS AND ENGINEERING | 2012年 / 41卷
基金：
中国国家自然科学基金;
关键词：
spinel ferrite; sol-gel method; saturation magnetization; coercivity; HIGH COERCIVITY; POWDERS;
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
CoFe2O4 and Dy-doped CoFe2O4 (CoFe(2-x)DyrO(4), x=0, 0.025, 0.05 and 0.075) magnetic nanocrystalline ferrites have been synthesized by sol-gel and self-combustion method. The spinel phase structure. of nanocrystalline CoFe2-xDyxO4 is formed at about 400 degrees C confirmed by Thermal Gravity Analysis (TGA) and Differential Scanning Calorimetry (DSC). According to the results from X-ray diffraction (XRD), all samples are sintered at 800 degrees C, and the average size of Dy-doped samples is smaller than that of pure CoFe2O4. Furthermore, the magnetic properties of CoFe2-xDyxO4 were discussed by vibrating sample magnetometer (VSM), indicating an obvious increase of coercivity and decrease of saturation magnetization with the Dy-doped content. We think that superexchange interactions and spin-orbital coupling should play an important role on the coercivity of CoFe2-xDyO4.
引用
收藏
页码：523 / 526
页数：4
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