Redox reactions in Fe2O3, As2O5 and Μn2O3 doped soda-lime-silica glasses during cooling - A high-temperature ESR investigation

Abstract

Redox equilibria in glass melts and in solid glasses, containing more than one type of polyvalent element, may shift during cooling. This was investigated by the aid of ESR spectroscopy in the temperature range from 25 to 680 °C in glasses, containing iron oxide and additionally arsenic or manganese oxides. The equilibrium was frozen in at temperatures below 400 °C. Above this temperature, redox equilibria are established again and no kinetic hindrance is visible. This is in good agreement with the results from theoretical treatments.