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

THE EFFECT OF GLASS COMPOSITION ON THE Fe²⁺/Fe³⁺ EQUILIBRIUM

Ch. Rüssel, S. Gerlach

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.

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