Thermodynamic Database Development for the ZrO2-MgO-MnOx System

• Published in: Journal of phase equilibria and diffusion Vol. 41; no. 5; pp. 654 - 671
• Main Authors: Saenko, Ivan, Fabrichnaya, Olga
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.10.2020; Springer Nature B.V
• Subjects: Ceramics; Composites; Crystallography and Scattering Methods; Differential thermal analysis; Engineering Thermodynamics; Glass; Halites; Heat and Mass Transfer; Interaction parameters; Ionic liquids; Liquid phases; Magnesium oxide; Metallic Materials; Natural Materials; Physics; Physics and Astronomy; Solid solutions; Spinel; Stability; Stabilization; Thermodynamics; Zirconium dioxide; thermodynamic modelling; zirconia; magnesium oxide; phase diagrams; manganese oxides
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-020-00832-2

Thermodynamic description of the ZrO 2 -MgO-MnO x was derived for the first time using available experimental data on phase relations in air and protective gas atmosphere. Solid solution phases were modelled using compound energy formalism. The liquid phase was described by the modified two-sublattice model for ionic liquid. Solubility of ZrO 2 was modelled in cubic spinel and MgO-MnO solid solution (halite structure) and therefore the Gibbs energies of Zr-containing endmembers were introduced. Ternary interaction parameters were introduced for halite, cubic spinel and cubic ZrO 2 to reproduce the stabilization of cubic ZrO 2 at temperatures below its stability in bounding systems and stabilization of cubic spinel at temperatures above its stability limit in the bounding systems. The obtained thermodynamic database was used to interpret results of differential thermal analysis.