共沉淀法制备超细LaCoO_3中聚乙二醇的作用研究  

Effects of Additive-PEG in Preparation of Ultrafine Powder LaCoO_3 via Coprecipitation

作　　者：姚根有[1] 李延斌[1] 逯宝娣[2] 卫芝贤[1] 

机构地区：[1]中北大学理学院化学系,山西太原030051 [2]太原科技大学化学与生物工程学院,030021

出　　处：《稀有金属》2007年第2期192-196,共5页Chinese Journal of Rare Metals

基　　金：2006年兵器青年创新基金项目

摘　　要：通过zeta电位、红外光谱等研究了用共沉淀方法制备LaCoO3时分散剂-聚乙二醇PEG-4000)的作用机制;通过粘度测定选择其适宜的使用量。结果表明:聚乙二醇的防团聚性能是通过在超细粉体的前驱体上吸附,进而主要通过空间位阻稳定机制发挥作用的。当其使用量为前驱体质量的3.0%时,可制备出团聚程度轻、分散性良好的超细LaCoO3粉体。The effects and the mechanism of additive PEG-4000 in the preparation process of perovskitetype LaCoO3 uhrafine powder via coprecipitation were studied by means of particle size analysis, IR spectrum, Zeta potential measurement. The suitable additive amount （3.0%） was determined by means of viscosity measurements. The experimental results showed that agglomeration of precursor was reduced by the steric effect of PEG-4000 adsorbing on it, and the powder product quality was greatly influenced by the added amount of PEG-4000. The well-dispersed perovskite-type LaCoO3 uhrafine powder can be obtained by adding suitable amount of PEG-4000 （3.0%）.

关 键 词：LACOO3 聚乙二醇 分散剂 

分 类 号：O614.331[理学—无机化学]