Ceramics-Silikáty 43, (4) 165 - 168 (1999)

Alkali-earth alkaline-silicate and -aluminosilicate glass melts of various compositions doped with 0.2 to 0.5 mol% Fe₂O₃ 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. The oxidized state is also favoured if the type of alkali is varied from Li₂O to K₂O. Empirical correlations enabling the calculation of thermodynamic data from the melt composition are given.