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

摘要

Mutual separation characteristics for binary oxide mixtures Y2 O3-Sc2 O3, Y2 O3-La2 O3, Y2 O3-Nd2 O3and Y2 O3-Sm2 O3 using a stepwise selective chlorination-chemical vapor transport(SC-CVT) reaction mediated by vapor complexes KLnCl4 were 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, KYCl4 and KLnCl4 and the selective chlorination of binary oxides at 800 K. Furthermore, the separation characteristics of vapor rare earth complex KLnCl4 were studied compared with those of LnAlnCl3n+3.