Spectroscopic investigations of barium aluminophosphate glasses containing pairs of transition elements

Abstract

In barium-aluminophosphate glasses containing two transition elements (two redox pairs) vanadium and iron ions are oxidized by manganese (combinations vanadium-manganese and iron-manganese), iron ions by vanadium (combination iron-vanadium). For low and intermediate concentrations of transition metal ions the redox equliibrium shift is complete during cooling from the melting temperatures, but for high concentrations it remains mostly incomplete (depending on the specific combination). The influence on Tg is given as an example for medium concentrations of Fe-V (8 mol).