摘要
借助差热分析、红外吸收光谱和Ｘ射线衍射技术研究了硝酸盐－柠檬酸盐凝胶的热分解和燃烧过程，发现具有一定组成的镍铜锌铁硝酸盐和柠檬酸形成的凝胶具有自蔓延燃烧特征，燃烧后直接形成粒径为２０～５０ｎｍ具有尖晶石结构的单相铁氧体粉末，调整硝酸盐和柠檬酸的比例可控制燃烧速率和燃烧过程。
The combustion process of nitrate-citrate gels was studied using DTA, IR spectra and XRD techniques. The results reveal that the dried gels, formed from metal(Ni,Cu,Zn and Fe)nitrates and citric acid, have auto_combustion behavior. The single phase NiCuZn ferrite powder with spinel structure and particle size of 2050 nm are directly synthesized after auto_combustion of gels, without calcination at higher temperature. The combustion rate and process can be controlled by changing the ratio of nitrate to citric acid, and then the particle size and magnetic structure can be controlled.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
1999年第4期466-470,共5页
Journal of The Chinese Ceramic Society
基金
国家"863"高技术新材料领域资助项目
关键词
自燃烧
铁氧化
纳米粉末
柠檬酸盐
凝胶
sol-gel technique, auto_combustion, NiCuZn ferrites, nano_particles
