Synthesis and magnetic properties of hard magnetic (CoFe2O4)-soft magnetic (Fe3O4) nano-composite ceramics by SPS technology

被引：70
作者：
Fei, Chunlong [1 ,2 ]
Zhang, Yue [1 ,2 ,3 ]
Yang, Zhi [1 ,2 ]
Liu, Yong [1 ,2 ]
Xiong, Rui [1 ,2 ,3 ]
Shi, Jing [1 ,2 ,4 ]
Ruan, Xuefeng [1 ,2 ]
机构：
[1] Wuhan Univ, Key Lab Artificial Micro & Nano Struct, Minist Educ, Wuhan 430072, Peoples R China
[2] Wuhan Univ, Sch Phys & Technol, Hubei Key Lab Organ & Polymer Optoelect Mat, Wuhan 430072, Peoples R China
[3] Hubei Univ, Minist Educ, Key Lab Green Preparat & Applicat Funct Mat, Wuhan 430062, Peoples R China
[4] Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2011年 / 323卷 / 13期
基金：
美国国家科学基金会; 中国国家自然科学基金;
关键词：
CoFe2O4/Fe3O4 nano-composite ceramic; Exchange spring behavior; SPS; Magnetic property; NANOPARTICLES; DEPENDENCE; MEDIA;
D O I：
10.1016/j.jmmm.2011.02.014
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
CoFe2O4/Fe3O4 nano-composite ceramics were synthesized by Spark Plasma Sintering. The X-ray diffraction patterns show that all samples are composed of CoFe2O4 and Fe3O4 phases when the sintering temperature is below 900 degrees C. It is found that the magnetic properties strongly depend on the sintering temperature. The two-step hysteresis loops for samples sintered below 500 degrees C are observed, but when sintering temperature reaches 500 degrees C, the step disappears, which indicates that the CoFe2O4 and Fe3O4 are well exchange coupled. As the sintering temperature increases from 500 to 800 degrees C, the results of X-ray diffractometer indicate the constriction of crystalline regions due to the ion diffusion at the interfaces of CoFe2O4/Fe3O4 phases, which have great impact on the magnetic properties. (C) 2011 Elsevier B. V. All rights reserved.
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收藏
页码：1811 / 1816
页数：6
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