La0.8Sr0.2Ga0.8Mg0.2O3-δ thin films for IT-SOFCs: Microstructure and transport properties correlation.

摘要

Highly textured La0.8Sr0.2Ga0.8Mg0.2O3 (LSGM) films with columnar structure were grown by pulsed laseruddeposition on (001) NdGaO3 and SrTiO3 buffered (001) MgO substrates. Combined analysis of the filmsudstructure and morphology and EIS measurements showed that the transport properties are mainlyudlimited by perpendicular grain boundaries effects. Increasing the film thickness, columnar nanosizedudgrains tend to coalesce leading to a decrease of grain boundary concentration, hence to enhancedudconductivity.