Density, Molar Volume, and Surface Tension of Molten Li[sub 2]CO[sub 3]-Na[sub 2]CO[sub 3] and Li[sub 2]CO[sub 3]-K[sub 2]CO[sub 3] Containing Alkaline Earth (Ca, Sr, and Ba) Carbonates

The density, molar volume, and surface tension of binary, ternary, and quaternary molten carbonate mixtures of and containing alkaline earth (Ca, Sr, and Ba) carbonates were measured using a maximum bubble pressure technique. The addition of alkaline earth carbonates resulted in increases in the density and surface tension of the molten carbonate mixtures. The apparent molar volume of a component carbonate in mixtures can be derived from the density data, assuming additivity, and inversely be used to estimate the molar volume and density of mixtures within an error of 1%. The surface tensions of alkali-alkaline earth carbonates were proportional to the mole fraction of the added alkaline earth carbonate.