The Optical Basicity and Fe<SUP>2+</SUP>–Fe<SUP>3+</SUP> Redox in Oxyacid Salt Systems

Abstract

The optical basicity (Λ; Pb2+ as probe ion) of various oxide glass systems has been measured to establish the new basicity scale of oxyacid salt melts. Best conditions of glassy fragments to measure Λ were determined. Problems in establishing the new basicity scale using Λ-values are discussed, and also relation between Λ and Fe2+–Fe3+ redox equation is discussed in terms of Fe3+-constitution. Λ has the posibility of showing the Lewis and new scale of basicity in these melts.