About Electrochemical Reactions Between a BaO- and a PbO-Rich Melt, Short-Circuited by Platinum

摘要

The "Reboiling" effect is well known. If glass fragments with very different alkali oxide contents are remelted together in a platinum crucible, there can take place a local generation of gas bubbles. Similar effects were observed in a study of the Ba/Pb interdiffusion kinetics between two melts with the same molar composition (MO)_(33.3)(B_2O_3)_(66.7-s)(EO_2)_s (M = Ba and Pb, resp.; E = Ge, s = 0.15 and Si, s = 0.10, resp.). The thermodynamic potential of the melts and the electrochemical mobilities of the ions Ba~(2+) and Pb~(2+) will be discussed in connection with the above described phenomenon. At 700℃ the Ba/Pb ion-exchange in the ratio 1/1 shows a dominant viscosity-controlling. The formation of gas bubbles is caused by reactions, influenced by the experimental arrangement and by the melt compositions.