中國有色金屬學(xué)報(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 14 No. 2 April 2004 |
Y2O3-Ln2O3(Ln = Sc, La, Nd, Sm) using stepwise
selective chlorination-chemical vapor trans
（1. Department of Chemistry, South China Normal University, Guangzhou 510631, China;
2. Department of Metallurgy, Hebei Institute of Technology, Tangshan 063009, China;
3. Department of Chemistry, Northeastern University, Shenyang 110006, China）
Abstract:Mutual separation characteristics for binary oxide mixtures Y2O3-Sc2O3, Y2O3-La2O3, Y2O3-Nd2O3and Y2O3-Sm2O3using a stepwise selective chlorination-chemical vapor transport
(SC-CVT) reaction mediated by vapor complexes KLnCl4were investigated. The total transported yields of the chlorides produced from the oxide mixtures are in the order of NdCl3>SmCl3>LaCl3>YCl3>ScCl3, the main deposition temperature of the chlorides is in the order of ScCl3< YCl3<SmCl3<NdCl3<LaCl3, and the largest separation factor values are 1 100 for Y∶Sc, 14.88 for Y∶La, 9.86 for Y ∶Nd and 16.45 for Y∶Sm in the temperature range from 1 000 K to 1 120 K, while 157.7 for La∶Y, 51.6 for Nd∶Y and 12.4 for Sm∶Y in the temperature range from 1 200 K to 1 300 K, respectively. The results were discussed on the difference of KScCl4, KYCl4and KLnCl4and the selective chlorination of binary oxides at 800 K. Furthermore, the separation characteristics of vapor rare earth complex KLnCl4were studied compared with those of LnAlnCl3n+3.
Key words: rare earth oxides; separation; chemical vapor transport reaction; KLnCl4
