摘要
以Ce(NO3)3·6H2O和(NH4)2CO3为沉淀源,利用柠檬酸作为络合剂和分散剂,实现了对CeO2前驱体的形貌和尺寸控制,并采用TEM,TGA和XRD等方法对前驱体及其热分解所得纳米CeO2的形貌及结晶性等进行了表征。结果表明,随着柠檬酸加入量的提高,前驱体形貌从纳米线向类球形颗粒变化,焙烧生成的纳米CeO2颗粒的形貌具有明显继承性,所得CeO2属于立方萤石结构,且随焙烧温度的提高,晶化程度增大。
The carbonate precursors with different shapes and sizes were prepared by means of coprecipitation with cerium nitrate as the starting salts, ammonium carbonate as the precipitator and citric acid as the complexing agent and dispersant. Precursors and calcined powders were characterized using TEM, TGA and XRD. The results indicate that the morphology of precursors changes from nanowires to spherical particles with the increase of citric acid. The calcined CeO2 nanoparticles inherit obviously the morphology of precursors. The as-prepared CeO2 has the cubic crystal structure of fluorite, and the degree of crystallization increases with roasting temperature.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2006年第2期247-250,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金资助项目(20171034)
苏州大学"211"工程资助项目
关键词
CEO2
湿化学方法
共沉淀
柠檬酸
稀土
CeO2
wet-chemical method
coprecipitation
citric acid
rare earths
