摘要
以化学气相传输法制取无水LaBr3、GdBr3和LuBr3。以稀土氧化物为原料,与铝粉及溴直接进行反应,可得到LnBr3和Al2O3的混合物。当铝与溴过量时,铝与溴生成的AlBr3,在高温下形成气态Al2Br6,并与LnBr3反应得到气态配合物,该配合物在低温分解。控制适当的温度梯度场,可实现LnBr3与其他固体分离。产物纯度>99.5%。利用化学气相传输法可获得纯度较高的无水LnBr3。
The preparation of anhydrous lanthanide bromides by chemical vapor transport method is reported. A mixture of LnBr_3 and Al_2O_3 is formed when Ln_2O_3 react directly with Al powder and Br_2. AlBr_3 is also formed with excess amount of Al and Br_2. Vapor Al_2Br_6 forms at high temperature. It reacts further with LnBr_3 to become complex LnAl_3Br_(12) and the complex decomposes at low temperature. LnBr_3 was separated from other solids by means of chemical vapor transport at a temperature gradient from 753K to 453K. The purity of products was more than (99.5%.)
出处
《稀土》
EI
CAS
CSCD
北大核心
2004年第2期8-9,12,共3页
Chinese Rare Earths
基金
国家自然科学基金资助项目(50274027)
关键词
稀土
制备
化学气相传输
rare earths
preparation
chemical vapor transport
