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Mixed oxide powders prepared by ashing filter paper soaked in aqueous salt solutions were heat‐treated in the range 800° to 1150°C. Compositions spanning the range NaAlO2 to pure Al2O3 were examined. A phase with the mullite structure, λ‐Na2O ·xAl2O3 with x varying from 3 to ≊ 12, and a new hydrated form of sodium aluminate, ρ‐Na2O · Al2O3· 6H2O, were found. The stability ranges and decomposition behavior of these materials were determined. A K analog to the A phase was also found.

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