Mutual separation characteristics for binary oxides Y₂O₃-Ln₂O₃(Ln = Sc, La, Nd, Sm) using stepwise selective chlorination-chemical vapor transport reaction mediated by vapor complexes KLnCl₄^①

来源期刊：中国有色金属学报(英文版)2004年第2期

论文作者：孙艳辉 陈振飞 王之昌

文章页码：412 - 416

Key words：rare earth oxides; separation; chemical vapor transport reaction; KLnCl₄

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< YCl₃333, 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 LnAl_nCl_3n+3.