YbCl_3－CaCl_2－NaCl三元体系相图的研究

Investigation on Phase Diagram of YbCl_3-CaCl_2-NaCl

借助ＤＴＡ研究了ＹｂＣｌ３－ＣａＣｌ２－ＮａＣｌ三元体系相图，发现该体系有对应于ＹｂＣｌ３、ＣａＣｌ２、ＮａＣｌ、Ｎａ３ＹｂＣｌ６的４个液相面，５条二次结晶线，１个三元低共熔点Ｅ（８７．０％ＹｂＣｌ３，１．０％ＣａＣｌ２，１２．０％ＮａＣｌ；４５０℃）和三元转熔点Ｐ（６１．０％ＹｂＣｌ３，１９．０％ＣａＣｌ２，２０．０％ＮａＣ１；４７４℃）。

The phase diagram of YbCl3-CaCl2-NaCl ternary system has been investigated by means of DTA, It is found that there are 4 fields corresponding to the primary crystallization of YbCl2,CaCl2,NaCl and Na3YbCl6 respectively and 5 univariant lines related to the secondary crystallization in this system.The two reactions occurred in this system are:LYbCl3+CaCl2+Na3YbCl6 E(87.O%YbCl3,1.O%CaCl2,12.0%NaCl;450℃);L+NaCl Na3YbCl6+CaCl2P(61.0%YbCl3,19.0%CaCl2,20.0%NaCl;474℃)