摘要
以聚乙烯醇、镁盐和铬盐为原料,采用微波法制备了严格计量比的铬酸镁纳米晶。原料中金属离子与聚乙烯醇单体的摩尔比为1:3,在2.45GHz及不同微波功率作用下,首先制得铬酸镁前驱体。在500℃以上煅烧前驱体一定时间后得到铬酸镁纳米晶。铬酸镁纳米晶的X射线衍射和透射电镜表征表明:微波法能够得到具有良好尖晶石结构的铬酸镁纳米晶,是一种极有前景的合成纳米复合氧化物的新方法。
Polyvinyl alcohol and Mg and Cr nitrates were used as materials. Stoichiometric MgCr2O4 spinel nanocrystals were prepared by a microwave method. The molar ratio of metal ion to PVA monomer unit was 1：3 Precursors to the MgCr2O4 spinel was first prepared under 2.45 GHz and different powers of microwave. The MgCr2O4 nanocrystals were produced by calcining the precursors at temperatures higher than 500 ℃. The MgCr2O4 nanoerystals were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The results showed that microwave method can be prepared MgCr2 O4 nanocrystals with good spinel structure. It was an effective method for nano-complex oxides synthesis.
基金
山东省自然科学基金资助项目(Y2007B25)
关键词
微波法
纳米晶
尖晶石
铬酸镁
聚乙烯醇
microwave method
nanocrystals
spinels
magnesium chromite
polyvinyl alcohol
