The effect of alumina on the Sn/Sn redox equilibrium and the incorporation of tin in Na2O/Al2O3/SiO2 melts |
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Authors: | Darja Benne Markus Menzel |
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Institution: | a Otto-Schott-Institut, Jena University, Fraunhoferstr. 6, 07743 Jena, Germany b Institut für Physikalische und Theoretische Chemie, Hans-Sommer-Str. 10, 38106 Braunschweig, Germany |
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Abstract: | Glasses with the basic compositions 10Na2O · 10CaO · xAl2O3 · (80 − x)SiO2 (x=0, 5, 15, 25) and 16Na2O · 10CaO · xAl2O3 · (74 − x)SiO2 (x=0, 5, 10, 15, 20) doped with 0.25-0.5 mol% SnO2 were studied using square-wave-voltammetry at temperatures in the range from 1000 to 1600 °C. The voltammograms exhibit a maximum which increases linearly with increasing temperature. With increasing alumina concentration and decreasing Na2O concentration the peak potentials get more negative. Mössbauer spectra showed two signals attributed to Sn2+ and Sn4+. Increasing alumina concentrations did not affect the isomer shift of Sn2+; however, they led to increasing quadrupole splitting, while in the case of Sn4+ both isomer shift and quadrupole splitting increased. A structural model is proposed which explains the effect of the composition on both the peak potentials and the Mössbauer parameters. |
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Keywords: | V130 T240 M353 S440 |
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