溶胶-凝胶法制备La_2O_3纳米粉体  

Preparation of Nanocrystalline La_2O_3 by Sol-Gel Method

作　　者：王茂林[1] 王新刚[1] 杨志懋[1] 王亚平[2] 丁秉钧[1] 

机构地区：[1]西安交通大学,陕西西安710049 [2]中科院金属研究所,辽宁沈阳110016

出　　处：《稀有金属材料与工程》2005年第3期425-428,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助项目(50071043)

摘　　要：以普通La2O3,硝酸,聚乙二醇为原料,利用溶胶-凝胶法制备了纳米La2O3粉体,利用TG-DTA,XRD,TEM等各种测试方法对干凝胶300℃灼烧所得前驱体粉末的分解过程及最终形成的纳米氧化镧粉体进行了分析和表征,并研究了浓度、搅拌和分散剂聚乙二醇(PEG)添加量等因素的改变对La2O3 粉体的粒径、形态的影响。实验结果表明,在适当工艺参数下,可以制得平均粒径小于50 nm 的La2O3粉体。Nanocrystalline La2O3 was prepared by sol-gel process using common La2O3, HNO3 and PEG The decomposition process of the precursor powder and the calcened nanocrystalline La2O3 formed at the end were charactered with various techniques: TG-DTA, XRD and TEM and the effects of some factors such as pH value of the solution, stirring rate and the amount of the PEG in the solution on the particle size and morphology are investigated. The result shows that the nanocrystalline La2O3 can be obtained with particle diameter of 30 nm similar to 50 mn under appropriate conditions.

关 键 词：纳米La2O3 溶胶 凝胶法 稀土 

分 类 号：TB383[一般工业技术—材料科学与工程]