Effect Of Glass Composition On The Fe2+/Fe3+ Equilibrium

Alkali-earth alkaline-silicate and -aluminosilicate glass melts of various compositions doped with 0.2 to 0.5 mol% Fe203 were studied using square-wave voltammetry. The increase in alkali content, as well as the increase in lime and alumina contents led to a shift in the redox equilibrium to the oxidized state. Empirical correlations enabling the calculation of thermodynamic data from the melt composition are given.