Abstract
Different techniques were applied to convert samples of sodium beta alumina to hydronium beta alumina. Fully and partially converted samples, obtained in boiling concentrated H2SO4 from crystals of monofrax sodium beta alumina as starting material, were characterized by chemical analysis, thermogravimetric measurements and X-ray diffraction analysis. The fully hydrated form of hydronium beta alumina contained about three molecules of water normalized for the sodium content of the starting material while the partially hydrated form had about two molecules of water in our work. The conversion appears to proceed with a moving boundary from the surface into the bulk.
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