Abstract
X-ray emission and Rutherford backscattering spectroscopies were used to characterize the dynamic chemical response in two borosilicate glassmelts (both Pyrex™ composition, one with 0.08 at.% Fe added) reacted with a Au-30Sn liquid alloy. Reactions were done at temperatures of 1250–1350°C for 30 min under a reducing atmosphere. Because of the metal alloy design and the glass structure, the chemical diffusion response shows less Sn incorporation into the glassmelt than in conventional commercial soda-lime float; the addition of Fe 3+ acts decisively to reduce the kinetics of Sn penetration. The results indicate a cation-diffusion-limited reduction reaction as the dominant kinetic mechanism working towards equilibrium in the silicate melt/metal melt system. The proposed kinetic model is consistent, too, with many idiosyncratic features of chemical concentration profiles observed in soda-lime float glass.
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