Co_3O_4纳米颗粒的溶胶凝胶法制备及磁性  

Synthesis and magnetic property of Co_3O_4 nanoparticles using sol-gel method

作　　者：韩立安[1] 常琳[1] 牟国栋[2] 孟泉水[1] 朱金山[1] 

机构地区：[1]西安科技大学理学院 [2]西安科技大学材料科学与工程学院,陕西西安710054

出　　处：《西安科技大学学报》2008年第3期602-604,共3页Journal of Xi’an University of Science and Technology

基　　金：西安科技大学培育基金项目(200737)

摘　　要：采用PVA水溶液溶胶凝胶成功制备了粒径为25 nm的Co3O4纳米颗粒,用热重-差热仪、X射线衍射仪、超导量子干涉仪对样品进行了表征。结果表明:当加热温度低于500℃时,产物中含有CoO杂相;500℃以上时,产物为纯相Co3O4纳米颗粒。Co3O4纳米颗粒(25 nm)为立方尖晶石结构,晶胞参数a=0.807 66 nm.颗粒形貌基本为球形,颗粒大小分布较均匀。Co3O4纳米颗粒(25 nm)呈现反铁磁向顺磁转变,其奈耳温度TN约为40 K。Cobalt oxide （ Co3O4 ） nanoparticles have been prepared using sol-gel method. DSC - TG, X- Ray diffraction（XRD）, superconductor quantum interference device were used to characterize Co3O4 nanoparticles. The product is single phase without any observable traces of Co monoxide when the heating temperature is above 500 ℃. The XRD results indicated that Co3O4 nanoparticles （25 nm） was well-crystallized spinel cubic phase with a cell constant of α = 0.807 66 nm. The nanoparticles are basically spheral shape and the size of the nanoparticles are uniform on the whole. There is a transition from the antiferromagnetic to paramagnetic for the nanoparticels and the neel temperature is about 40 K.

关 键 词：溶胶凝胶 纳米颗粒 CO3O4 磁性 

分 类 号：TB444[一般工业技术]