|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Stability, Phase Transformations, and Reactive Phase Formation in Electronic Materials XVI
||The Thermodynamic Investigation of the Effect of CO2áto the Stability of (La0.8Sr0.2)0.98MnO3▒δ
||Shadi Darvish, Yu Zhong
|On-Site Speaker (Planned)
Thermodynamic predictions regarding the formation of secondary phases in atmosphere containing CO2 on the (La0.8Sr0.2)0.98MnO3▒δ (LSM-20) surface and at the LSM-20/8YSZ interface have been studied using the CALculation of Phase Diagram (CALPHAD) approach. The effects of temperature, O2 partial pressure, CO2 partial pressure and the cathode composition on formation of secondary phases have been investigated and correlated with the available experimental results found in the literature. Our study predicts that the SrCO3 has the possibility to form on the surface and at triple phase boundaries as a result of CO2 exposure to the system. In addition, it is indicated that the CO2 exposure does not change the electronic/ionic carriers’ concentration in perovskite phase. The observed electrical conductivity drop is predicted to occur due to the formation of secondary phases such as LaZr2O7, SrZrO3 or SrCO3, at the LSM-20/8YSZ interface, resulting in the blocking of the electron/ion transfer paths.
||Planned: Supplemental Proceedings volume