铁酸钴纳米粒子的化学共沉淀法制备及表征

摘要

采用弱碱 NH4 HCO3作为沉淀剂，CoCl2·6H2 O和 FeCl3·6H2 O作为反应物，在一定摩尔比条件下，通过化学共沉淀法制备了铁酸钴纳米粒子，并采用 FT-IR、XRD、TEM和振动样品磁强计对其进行了表征。结果表明，制得的铁酸钴纳米粒子为尖晶石型结构，其粒径为20 nm左右，并且由于反应过程中弱碱 NH4 HCO3分解产生的CO2和 H2 O 气体对产物的阻隔作用，制得的铁酸钴纳米粒子的分散性较好，饱和磁化强度为55.5 Am2·kg-1。%With weak alkali NH4HCO3 as precipitant,CoCl2·6H2O and FeCl3·6H2O as react-ants,cobalt ferrite nanoparticles are prepared through chemical coprecipitation method at a cer-tain mole ratio,and are characterized via FT-IR,XRD,TEM and vibration sample magnetom-eter.The experimental results show that due to the separation effects of CO2 and H2 O gas de-composed from NH4 HCO3 on resultants,the as-prepared cobalt ferrite nanoparticles are of spi-nel structure with its size 20 nm or so,and well-dispersed with saturation magnetization 55.5 Am2·kg-1 .