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Thermodynamic Assessment of the System MgO–Al 2 O 3
Author(s) -
Hallstedt Bengt
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb04216.x
Subject(s) - calphad , phase diagram , spinel , thermodynamics , stoichiometry , solid solution , solubility , materials science , phase (matter) , solid solubility , chemistry , metallurgy , physics , organic chemistry
The system MgO–Al 2 O 3 was assessed with the CALPHAD technique using a computerized optimization procedure called PARROT. Two of the solid phases, MgO and spinel, showed extensive solid solubility at high temperature and were modeled with the compound energy model. The third solid phase, α ‐Al 2 O 3 , was modeled as a stoichiometric phase. For the liquid phase, an ionic two‐sublattice model was used. In total, 13 adjustable parameters were optimized: 3 for the MgO, 8 for the spinel, and 2 for the liquid. This resulted in a consistent thermodynamic description for most of the available experimental data points on the phase diagram as well of the thermodynamic properties.