KF－LiCl－CaCl_2系相图研究

PHASE DIAGRAM OF KF-LiCl-CaCl_2 SYSTEM

用目测变温法、差热分析法及Ｘ射线粉末法测定了ＫＦ─ＬｉＣ─ＣａＣｌ_２系熔盐相图，发现ＫＦ在ＬｉＣｌ－ＣａＣｌ_２熔盐溶液中呈负偏差，并对ＫＦ－ＬｉＣｌ－ＣａＣｌ_２系相图和已经研究的ＫＦ－ＬｉＣｌ－ＢａＣｌ_２及ＫＰ－ＬｉＣｌ－ＳｒＣｌ_２系相图进行了讨论，发现碱土金属氟化物的初晶面积和溶解能参数之间存在一定的关系．

Phase diagram of KF-LiCl-CaCl_2 system has been determined by methods of visual variable-temperature, DTA and XRD. A negative deviation for KF occurs in molten salt LiCl-CaCl_2 solution. The semi-quantitative relationship between the relative area of primary crystallization region for fluoride of divalent alkaline metal and the energetic parameter of solution was also discussed together with KF-LiCl-BaCl_2 and KF-LiCl-SrCl_2 systems made previously by the authors.