Evaluation of Surface Tension of Molten Ionic Mixtures

Abstract

A thermodynamic model was derived to evaluate the surface tension of molten ionic mixtures by considering the ratio of the radius of cation to that of anion. The present model reproduces the following characteristics of the composition dependence of surface tension in molten alkaline–halide ionic mixtures precisely.
• almost linear change with the composition in common cation systems:
• large concave feature of the composition dependence in common anion systems.
The present model can be applied to evaluate the surface tension molten ionic mixtures with complex anion such as sulfate as well as molten SiO₂ based binary systems considering effective ionic radii for complex anions.