2004•Chinese Rare EarthsRequires access
Direct Preparation of Anhydrous Lanthanide Bromides from Lanthanide Oxides
Yang Dong-mei
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Abstract
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%.)