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19卷    第1期    总第118期    2009年1月

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文章编号:1004-0609(2009)01-0114-05
热处理制度对纳米晶Mn0.6Zn0.4Fe2O4铁氧体纤维结构和
磁性能的影响
向  军1,沈湘黔1,朱永伟2

(1. 江苏大学 材料科学与工程学院,镇江 212013;
2. 南京航空航天大学 机电工程学院,南京 210016
)

摘 要: 以柠檬酸及金属盐为原料,采用有机凝胶先驱体转化法制备直径0.5~3.0 μm、平均晶粒尺寸为8.7~31.8 nm的Mn0.6Zn0.4Fe2O4铁氧体纤维。利用XRD、SEM和VSM分别对前驱体凝胶的结构、热处理产物的物相、形貌及磁性能进行表征。结果表明:Mn-Zn铁氧体相的稳定性主要受热处理气氛中氧含量的影响,在空气气氛中将发生部分分解,而在氮气气氛中能获得纯的尖晶石型铁氧体相;在400 ℃时获得的Mn0.6Zn0.4Fe2O4铁氧体纤维因晶粒尺寸小于临界尺寸而表现出超顺磁特性,但随热处理温度的升高和保温时间的延长,Mn0.6Zn0.4Fe2O4铁氧体纤维的饱和磁化强度、矫顽力和晶粒尺寸均逐渐提高,特别是在500 ℃以后,增长尤为显著。

 

关键字: Mn0.6Zn0.4Fe2O4;铁氧体纤维;有机凝胶先驱体转化法;热处理制度;磁性能

Effects of heat-treatment process on structure and magnetic properties of nanocrystalline Mn0.6Zn0.4Fe2O4 ferrite fibres
XIANG Jun1, SHEN Xiang-qian1, ZHU Yong-wei2

1. School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013, China;
2. School of Mechanical and Electrical Engineering, Nanjing University of Aeronaustics and Astronaustics,
Nanjing 210016, China

Abstract:The nanocrystalline Mn0.6Zn0.4Fe2O4 ferrite fibres with diameters between 0.5–3.0 μm and an average crystal size of 8.7–31.8 nm were prepared via organic gel precursor transformation process using metal salts and citric acid as raw materials. The structure and morphologies of the gel precursor and products obtained under different heat-treatment conditions were characterized by XRD and SEM, and the magnetic properties of the fibres were measured by VSM. The results show that the stability of Mn-Zn ferrite phase is mainly affected by the oxygen content in the heat-treated atmosphere. The Mn-Zn ferrite partially decomposes during the heat treatment under ambient atmosphere, while a single spinel-type ferrite phase is obtained in nitrogen atmosphere. Mn0.4Zn0.6Fe2O4 ferrite fibres formed at low heat treatment temperature of 400 ℃ exhibits superparamagnetism due to the grain size below threshold value. With increasing calcinating temperature and prolonging holding time, the saturation magnetization, coercivity and grain size for these fibres increase, and become obviously larger when the temperature is above 500 ℃.

 

Key words: Mn0.6Zn0.4Fe2O4; ferrite fibres; organic gel precursor transformation method; heat treatment process; magnetic properties

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

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

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