Powder synthesis and aerosol deposition of the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases for gas separation membrane application

Mixed-conducting oxide powders, BaCe0.9Y0.1O2.95 (BCY) and SrCe0.9Y0.1O2.95 (SCY), were prepared using a solid-state reaction method. X-ray diffraction patterns of the prepared powders showed the sharp peaks of the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases. XRD patterns and FE-SEM morphologies of the oxide powders, fabricated by attrition milling and ball milling, were compared. The oxide powders that were prepared by attrition milling showed rather large particles and severe necking between particles in FE-SEM images as well as residual reactant (BaCO3) and secondary phases (SrCeO3 and CeO2) in XRD patterns. The oxide powders prepared using ball milling showed particles under approximately 500 nm and typical XRD patterns of the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases. Ceramic membranes of the BaCe0.9Y0.1O2.95 and SrCe0.9Y0.1O2.95 phases were fabricated by the aerosol deposition method using the oxide powders synthesized. Two fabricated ceramic membranes demonstrated somewhat dense morphologies and relatively fine grains in the FE-SEM surface images.