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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XVII
Presentation Title Thermodynamic Stability Maps for the La0.6Sr0.4Co0.2Fe0.8O3±δ–SO2–O2 System for Application in Solid Oxide Fuel Cells
Author(s) Shadi Darvish, Yu Zhong
On-Site Speaker (Planned) Shadi Darvish
Abstract Scope Cathode degradation due to the formation of unwanted secondary phases as a result of reactions among cathode, electrolyte, and certain gas-phase species, would impact the long-term stability of the order to unravel the overlapping influences of the operating parameters on the formation of secondary phases, thermodynamic and electrochemical predictions in SO2 containing atmosphere on the La0.6Sr0.4Co0.2Fe0.8O3±δ (LSCF-6428) surface have been carried out utilizing the CALculation of Phase Diagram (CALPHAD) approach. The La-Sr-Co-Fe-O-S database was modified by addition of Gibbs energies of missing phases. The effect of temperature, SO2 partial pressure, O2 partial pressure as well as the cathode composition on the formation of secondary phases have been investigated and correlated with the previous investigations in the literature. It is predicted that La2O2SO4, SrSO4 and (Co, Fe) spinel phase has the possibility to form on the surface as a result of SO2 exposure to the system.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


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