Article ID Journal Published Year Pages File Type
1483823 Journal of Non-Crystalline Solids 2006 6 Pages PDF
Abstract

Liquids with the base compositions (16 − x/2)Na2O · xNaF · 10CaO · 74SiO2 (x = 0, 1, 3, and 4) and (10 − x/2) · Na2O · xNaF · 10CaO · yAl2O3 · (80 − y)SiO2 (x = 0, 1, 3, 5 and y = 5 and 15) doped with 0.25 mol% Fe2O3 were studied by means of square-wave voltammetry in the temperature range from 1000 to 1500 °C. With increasing temperature, the redox equilibria were shifted to the reduced state. Also while increasing the alumina concentration, the Fe2+/Fe3+-redox equilibrium is shifted to the reduced state. In the soda-lime–silica melt the addition of fluoride shifts the equilibrium to the oxidized state, while in the aluminosilicate melts with 15 mol% Al2O3, the equilibrium is shifted to the reduced state. In the aluminosilicate melts with 5 mol% Al2O3, the equilibrium was not affected by the fluoride concentration. This is explained by the structure of the respective glass compositions.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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