摘要
研究了用硫酸亚铁–硝酸钾氧化法在凹凸棒石悬浮液中即时合成磁铁矿制备凹凸棒石–Fe3O4纳米复合材料的可行性以及凹凸棒石对磁铁矿晶体生长控制和影响。X射线粉末衍射、透射电镜、磁化率分析等表征手段的分析结果表明:在制备凹凸棒石负载Fe3O4复合材料的过程中,凹凸棒石投加量和煅烧温度对复合材料的物相组成、形貌特征及磁学性质具有明显的影响。随着凹凸棒石添加量的增加,纳米Fe3O4颗粒变细、粒径分布更均匀。当凹凸棒石煅烧温度超过400℃以后,由于凹凸棒石表面性质的改变,抑制了Fe3O4结晶。
The feasibility of preparing palygorskite and magnetite composite material in a system of ferrous sulfate and potassium nitrate and the effect of palygorskite on magnetite crystallization were studied. The composite material was characterized with X-ray diffraction, transmission electron microscope and magnetic susceptibility. The results indicate that the amount and calcination tem-perature of palygorskite added in the system of ferrous sulfate-potassium nitrate have an effect on the size, distribution and magnetic properties of magnetite on the surface of palygorskite. The size of nano-magnetite decreases and the crystallite size is distributed more uniformly with the increase of the amount of palygorskite. When the calcination temperature is higher than 400 ℃, no magnetite crystal is formed in the system because the surface characteristics of palygorskite are changed.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第9期1195-1199,共5页
Journal of The Chinese Ceramic Society
基金
科技部863(2007AA06Z118)
国家自然科学基金(40772031,50774027)项目资助
关键词
凹凸棒石
磁铁矿
结晶作用
纳米复合材料
热处理
palygorskite
magnetite
crystallization
nanometer composite material
heat treatment
