| Redox Behavior of Sn and S in Alkaline Earth Borosilicate Glass Melts with 1 mol% Na2O |
| Ki-Dong Kim, Hyo-Kwang Kim |
| Department of Materials Science & Engineering, Kunsan National University |
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| ABSTRACT |
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Redox investigation of Sn and S ion was attempted in alkaline earth borosilicate glass melts with only 1 mol% $Na_2O$ by means of Square Wave Voltammetry (SWV). According to voltammograms, there was only one peak due to $Sn^{4+}/Sn^{2+}$ in melt doped with $SnO_2$. The calculated standard enthalpy and entropy of the reduction of $Sn^{4+}$ to $Sn^{2+}$ were 116kJ/mole and 62 J/mol K, respectively. The determined redox ratio, [$Sn^{2+}$] / [$Sn^{4+}$] in the temperature range of $1300{sim}1600^{circ}C$ was in $0.4{sim}2.1$. On the contrary, in the voltammogram of melt doped with $BaSO_4$ there was no peak due to $S^{4+}/S^o$ but shoulder that might be attributed to the adsorption of sulfur at the electrode. The absence of the peak related with $S^{4+}/S^o$ was discussed from the view-point of the thermal decomposition behavior of $BaSO_4$ in the glass batch. |
| Key words:
Multivalent ion, Redox equilibrium, Alkaline earth borosilicate glass melts, Square wave voltammetry |
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