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J. Korean Ceram. Soc. > Volume 45(2); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(2): 90.
doi: https://doi.org/10.4191/kcers.2008.45.2.090
Electrochemical Approach in Plasma Display Panel Glass Melts doped with Sulfate and Sulfide I. Oxygen Equilibrium Pressure
Ki-Dong Kim, Hyo-Kwang Kim
Department of Materials Science & Engineering, Kunsan National University
The oxygen gas behavior in PDP (plasma Display Panel) glass melts doped with sulfate ($SO_4^{-2}$) or blast furnace slag (BFS, $S^{2-}$) or both by means of yttria-stabilized zirconia (YSZ) electrodes was observed after the first fining. The temperature dependence of oxygen equilibrium pressure ($P_{O2}$) in each melt showed typical behavior, namely $P_{O2}$ decreased as temperature decreased. This suggests that an oxidation of $S^{4+}$ to $S^{6+}$ took place. However, the $P_{O2}$-value at constant temperature increased in the following order: BFS$P_{O2}$ of the melt doped with sulfate+BFS was much lower than that of the melt with only sulfate, although only 10% of sulfur was added by the BFS. This behavior can be explained by the redox reaction between sulfide ions in the BFS and dissolved oxygen ions in the melt during the first fining.
Key words: Oxygen equilibrium pressure, Sulfate, Sulfide, Redox reaction
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