Particle Coarsening Influence on Oxygen Reduction in LSM–YSZ Composite Materials

Abstract

AbstractThe microstructure influence on the oxygen reduction process for the LSM–YSZ composite materials has been studied in this paper. To localize the effect of particle coarsening influence, the oxygen isotope exchange measurements with the gas phase analysis have been performed for LSM–YSZ | YSZ | LSM–YSZ symmetric cells during 300 and 1000 hours at T = 850 °C and Po2 = 10−2 atm. In order to find quantitative relations the changes in the oxygen surface exchange and the diffusion coefficients and its microstructure parameters such as porosity and triple phase boundary (TPB) length have been compared. The rate determining stage of the LSM–YSZ degradation has been suggested to be the LSM‐phase surface diffusion and the LSM surface diffusion coefficient have been estimated.