The Measurement of the Phase Diagram of the LiCl-BaCl₂-SrCl₂

The LiCl-KCl-BaCl₂-SrCl₂quaternary system is of interest as a possible lectrolyte in the electroplating and electrochemical alloying of molten salt Up to now the phase diagram of the quaternary system and one of its subsystems LiCl-BaCl₂-SrCl₂ have not been measured,To obtain a better basis or understanding the LiCl-BaCl₂-SrCl₂-KCl system it is necessary to learn about the unknown ternary LiCl-BaCl₂-BrCl₂ system.
In this paper the phase diagram of the LiCl-BaCl₂-SrCl₂ system has been measured and the liquidus curves of its three subsystems have been checked by the DTA method.The binary systems LiCl-BaCl₂ and LiCl-SrCl₂ are simple eutectic ones with the eutectic points E1 and E₂ in 526℃, 33 mol%Ba-Cl₂, 67mol%LiCl and 489℃, 38mol%SrCl₂, 62mol%LiCl, respectively. The binary system BaCl₂-SrCl₂ is a continuous solid solution with a minimum temperature in 852℃, 35mol%BaCl₂, 65mol%SrCl₂.
According to the present measurements of three subsystems and three ternary polythermal projections the phase diagram of LiCl-BaCl₂-SrCl₂at 1 atmosphere is drawn in Fig. 8. The uncertainty in the liquidus temperatures is estimated to be±6K.
The ternary system LiCl-BaCl₂-SrCl₂ has a curve Ei-E-E₂ running betweem binary eutectics E1 and E₂ with a minimum temperature in E (482℃,58.4 mol%LiCl, 15.8mol%BaCl₂ and 25.8mol%SrCl₂). The curve E1-E-E₂ divided the ternary system into two liquidus surfaces, the LiCl liquidus surface and the BaCl₂-SrCl₂ solid soluton one. It is noted that the minimum temperature in the LICl-BaCl₂-SrCl 2 system is only a little lower than 489℃, the eutectic temperature of the LiCl-SrCl₂ system.