摘要
以柠檬酸和金属盐为原料,采用有机凝胶先驱体转化法成功制备了纳米晶Ni_x-Zn_(1-x)(x=0.25～0.75)铁氧体纤维。通过FTIR,TG/DSC,XRD及SEM对纤维先驱体凝胶的结构、热分解过程及热处理产物的物相、形貌进行了表征。采用VSM研究了铁氧体纤维的磁性能。结果表明:这种Ni-Zn铁氧体纤维表面光滑,直径均匀,有较大的长径比,最细纤维直径可达1μm以下;组成Ni_x-Zn_(1-x)(x=0.25～0.75)铁氧体纤维的晶粒大小在15.2～86 nm,主要受焙烧温度的影响;纤维的饱和磁化强度与矫顽力与其成分和焙烧温度有关,经800℃焙烧2 h后得到的Ni_(0.5)Zn_(0.5)铁氧体纤维的饱和磁化强度为12.723 A·m^2·kg^(-1)矫顽力为5851 A·m^(-1)。
Nanocrystalline Nix-Zn1-x（x=0.25～0.75） ferrite fibres were prepared by thermal decomposition of organic gel formed using citric acid and metal salts as raw material. The organic gels and their thermal decomposition were studied by FTIR, XRD, SEM and TG-DSC, and the magnetic properties of ferrite fibres were measured by VSM. The Ni-Zn ferrite fibres consisted of grains of size in the range of 15. 2 nm to 86 nm, and the size was determined by the calcination temperature （500～1000 ℃）. The Nix-Zn1-x（x=0.25～0.75） ferrite fibres showed a soft magnetism at room temperature. The Ni0.5Zn0.5Fe2O4 fibres obtained at 800 ℃ for 2 h exhibited saturated magnetization 12.723 A·m^2·kg^-1 and coercivity 73.142 A·m^-1.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2008年第A01期191-194,共4页
Rare Metal Materials and Engineering
基金
国家自然科学基金(50474038
50674048)项目资助
