摘要：研究一种以溶胶-凝胶作为前躯体制备纳米La₂O₂CO₃粉体的新方法,以柠檬酸和硝酸镧为原料,采用凝胶自蔓延燃烧法制备纳米La₂O₂CO₃粉体,并利用X射线衍射、差热分析、透射电镜等手段对合成产物进行表征,确定最佳的工艺条件。结果表明:在前驱溶液的pH值为2,烘干温度为400℃,煅烧温度为600℃时,可以制备出平均晶粒尺寸为30 nm的La₂O₂CO₃颗粒,且粉体的粒径均匀,粒径分布狭窄。

关键词： 柠檬酸;凝胶自蔓延燃烧法;纳米La₂O₂CO₃粉体

Abstract： A novel way of preparing La₂O₂CO₃ nano-particles with dry gel as the precursors was developed， which used citric acid， La（NO₃）₃·6H₂O via gel auto-spreading combustion method. XRD， TG-DTA， TEM were used for the sample characterization to find out the optimal technological conditions. The experiment results showed that La₂O₂CO₃ nano-particles with the average grain size of 30 nm were prepared under optimized conditions of precursor solution's pH value of 2， baking temperature of 400 ℃， calcination temperature of 600 ℃ and the prepared powders had uniform grain size as well as narrow size distribution. 

Keywords： citric acid； gel auto-spreading combustion synthesis；La₂O₂CO₃ nano-particles