Abstract
The absorption of water by powders of sodium, potassium, and lithium beta alumina was observed using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and x‐ray powder diffraction. For samples derived from Union Carbide beta alumina, no water absorption/adsorption was observed for potassium beta alumina, about 2.1 molecules of water per unit cell for sodium beta alumina, and about 4 molecules per unit cell for lithium beta alumina. All of these results are at 25°C with the composition at 400°C as a base line. Some samples also were observed to react with in the presence of water to form complex hydrated carbonates, which underwent multistage decomposition reactions upon heating.
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