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The PbO–Al 2 O 3  system has been extensively studied in literature. In the present study, experimental work was conducted in which equilibria between phases were investigated under air between 600°C and 800°C by X-ray diffraction. Three intermediate compounds reported in literature were confirmed, which are PbAl 12 O 19  (1PbO:6Al 2 O 3 ), PbAl 2 O 4  (1:1) and Pb 2 Al 2 O 5  (2:1). Results support a widely accepted version of the phase diagram in which these compounds exist. On the basis of the results obtained in this study and data considered from literature, a thermodynamic modeling according to the Calphad approach was performed, where all intermediate phases were considered as stoichiometric compounds and where the liquid phase was described by a two-sublattice ionic liquid model. Good agreement has been obtained from thermodynamic optimization in comparison with experimental results.

Phase equilibria investigations and thermodynamic modeling of the PbO–Al 2 O 3 system