Cationic Effect of Ionic Transport Properties of Mixed Alkaline-Earth Silicate Ternaries

摘要

The cationic effects on electrical conductivity and viscosity are investigated in of CaO-MgO-SiO_2 and CaO-BaO-SiO_2 melts. The antithetic tendencies for the effect of cation radius on electrical conductivity and viscosity are observed in silica-saturated composition and structurally relaxed compositions for both electrical conductivity and viscosity. Temperature dependence of each properties indicates that activation energy to overcome electrostatic energy is found to be dominant over strain field energy in structurally relaxed melt. Activation energy considerations are in agreement with Anderson-Stuart theory. The absence of electrostatic energy is confirmed by correlating two properties by Walden plot. The cationic effect of silicate melt structure is also studied by Raman spectroscopy of quenched slags. Degree of polymerization of melt is evaluated by calculating empirical NBO/T NBO/T of silicate melts shows maxima in both systems in the vicinity of eutectic compositions in spite of fixed basicity leaving the equilibrium phase of the melts playing a key role in melt structure.