13.1: Invited Paper : Carbonation Reaction of (Ca, Mg)O Protective Layer on PDP

We have been applying a low discharge voltage (Ca, Mg)O protective layer to plasma display panels (PDPs) to reduce their power consumption. However, (Ca, Mg)O is highly reactive with CO 2 , and the resulting carbonate formation during high‐temperature panel sealing in air impairs the low discharge voltage characteristic. We investigated the mechanism of the carbonation reaction that occurs on a (Ca, Mg)O surface during annealing in air at 450°C and found that the CO 2 diffuses through the formed CaCO 3 layer and that a (Ca, Mg)O + CO 2 r̊ CaCO 3 + MgO reaction then occurs. This carbonation reaction evidently stops when the growing MgO finally forms a layer at all boundaries between the CaCO 3 and (Ca, Mg)O regions.