Abstract
Experiments were carried out to measure the rate and extent to which silver and potassium ions exchange with the sodium ions in Monofrax sodium beta alumina (1.32Na 2O·11Al 2O 3) and high soda polycrystalline sodium beta alumina (nominal stoichiometry of 1.80Na 2O·11Al 2O 3). Ion exchange in molten nitrate melts at 350°C is complete within about 10 hours for 1–2 mm sized Monofrax beta alumina crystals. For the polycrystalline samples, however, exchanges with both silver and potassium reach limiting values of about 87% for silver and 84% for potassium after 50–80 hours. This is interpreted on the basis of second phases present in the polycrystalline samples and the apparent existence of non-labile sodium within the beta alumina grains.
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