Critical thermodynamic evaluation of oxide systems relevant to fuel ashes and slags Part 2: Alkali oxide–alumina systems

The associate species model was applied to the thermodynamic representation of liquids in the oxide systems Na2O–Al2O3 and K2O–Al2O3. The available experimental phase diagrams and thermodynamic data were collected and evaluated for the purpose of improving the solution database. These new data for the liquid phase, and for the solid compounds Na β- and β″-alumina, are compatible with data for the solid stoichiometric compounds from the FACT Pure Substance database. The phase equilibria calculated using the new optimised solution data show good agreement with the experimental results.