摘要
以稀土元素Nd ,Eu和Y为对象 ,利用比表面积分析仪和扫描电镜考察了各种沉淀条件对稀土氧化物的比表面和形貌的影响。结果表明 :降低沉淀温度和提高加料速度有利于获得较大比表面积的产品 ,但不利于产品颗粒晶型的完整化。稀土与草酸的比例以及陈化时间对样品的比表面积影响不大 ,但增加陈化时间 ,有利于改善氧化物颗粒的晶型以及尺寸分布。因此 ,在工业生产中 ,为了提高产品质量 ,陈需控制灼烧条件外 ,还应注意控制沉淀温度。
Nd 2O 3, Eu 2O 3 and Y 2O 3 were prepared from the corresponding oxalates under various precipitation conditions after calcining at 850 ℃ for 4 h. The BET specific surface area and morphology of the as prepared oxides were characterized by specific surface area analyzer and scanning electronic microscopy, respectively. The experimental results show that the samples produced at lower precipitation temperature in a higher feeding speed have higher specific surface area but the crystallite shape appears imperfect. The molar ratio of oxalic acid to rare earths and the aging time were proved to have little effects on the specific surface area; however, longer aging time is beneficial to improving the particle size distribution and crystallization.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2001年第5期471-473,共3页
Journal of the Chinese Society of Rare Earths
基金
国家重点基础研究发展规划项目 (G19980 6 130 0 )
关键词
稀土
稀土氧化物
沉淀条件
比表面积
形貌
生产工艺
草酸盐
rare earths
rare earth oxide
precipitation condition
specific surface area
morphology
