Abstract
Manometric and potentiometric studies of the oxide ion+oxygen reaction in molten alkali nitrate are reported. Sufficient oxygen was found to be absorbed by alkali nitrate melts after addition of Na 2O to convert virtually all of the added O 2− ion to O 2 2− and O 2 − ions. The equilibrium constant and the temperature dependence of the reaction 2 O 2 −=O 2+O 2 2− was determined over a temperature range of 250–400°C. The value of the equilibrium constant determined by the method used was found to depend on whether Na 2O, Na 2O 2, or NaO 2 was used as the starting material. Stabilized zirconia tubes were studied for use as oxide ion probes in these melts. In oxygen-containing melts the zirconia/melt interface was shown to respond to added Na 2O or NaO 2 in a manner similar to the response of a platinum wire dipped into the melt. This response is shown to be the expected one, for the cells studied. When nickel chloride was added to oxygen-saturated melts which contined Na 2O, a reaction was found to occur which resulted in the effective loss of two oxide ions from the melt for each nickel ion which was added.
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