纳米La_2O_3粉晶的制备及其表征

Preparation and Characterization of Nanocrystalline La_2O_3

以La(NO3)3.6H2O、NH4HCO3和聚乙二醇为原料,利用沉淀法制备了纳米La2O3粉体,利用XRD,TG-DTA和TEM等测试方法对干凝胶热分解过程及最终形成的纳米La2O3粉体进行了分析和表征,XRD法考察了前驱体在不同热处理条件下产物物相和晶粒度的变化情况,实验结果表明,在适当工艺参数下,前驱体经720℃,1h焙烧所得产物为平均粒径小于50nm的La2O3粉体。

Nanocrystalline La2O3 was prepared by chemical precipitation process using La（NO3）3·6H2O,NH4HCO3 and PEG.The decomposition process of xerogels powder and the calcened nanocrystalline La2O3 formed at the end were characterized by XRD,TG-DTA and TEM.The component and size of the product were characterized by X-ray diffraction（XRD） under different conditions of heat treatment.The result shows that the nanocrystalline La2O3 can be obtained with average particle diameter of 50nm under appropriate conditions.