Abstract
The current investigation deploys a computational thermodynamics approach to develop new materials for dual-phase composites. The chemical stability of (La0.9Sr0.1)0.95CrxFe1-xO3-δ and (La0.8Sr0.2)0.95CrxFe1-xO3-δ (x=0.5, 0.7, 0.8, and 0.9) with three fluorite phases of 8YSZ, 10Sc1YSZ, and 10Sc1CeSZ has been examined. The changes in the Sr-content and the Cr: Fe ratio in the perovskite phase have also been investigated under oxidizing and reducing atmospheres at elevated temperatures. The results show that SrZrO3 as the dominant secondary phase together with limited formations of (La0.5Zr0.5)O1.75 and La2O3. The experimental results have been incorporated into simulations performed by computational thermodynamics. Involved mechanisms to improve the chemical stability have been discussed based on correlations between the content of dopants and applied conditions. The results promote knowledge for the development of ceramic-based dual-phase composite membranes.
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