MISCIBILITY OF LIQUID METALS WITH SALTS .8. STRONTIUM-STRONTIUM HALIDE AND BARIUM-BARIUM HALIDE SYSTEMS

The phase diagrams of the alkaline earth metal-metal halide systems Sr-SrCl2, Sr-SrBr2, Sr-SrI2, Ba-BaBr2, and Ba-BaI2 were determined. Salt-metal miscibility is much greater than in the calcium systems and increases with the size of either the metal or halide ion. The critical solution (consolute) temperatures for the five systems above are 1106, 1064, 1056, 960, 914°, respectively, with the critical composition of approximately 52, 62, 66, 65, and 75 mole % metal, respectively. Most of the experimental results reported by Emons, et al., and their assumption of polymeric metal ions Mn2+ (n > 2) are shown to be in error. Rather an equilibrium M22+ ⇌ 2M2+ + 2e- is indicated as proposed earlier in connection with electrical conductance measurements.