Abstract

Abstract The stabilization of perovskite through trivalent cation substitution is a promising strategy for the development of oxygen permeation membranes. In this study, perovskite stabilization through yttrium substitution in (Ba x Sr 1- x )(Co 0.9 Y 0.1 )O 3-δ was investigated and compared with that of Al. A perovskite single phase of (Ba x Sr 1- x )(Co 0.9 Y 0.1 )O 3-δ was attained at a Ba concentration of 1.0 ≥ x ≥ 0.5, which was higher than the range at which the hexagonal polymorph occurred. This differed from (Ba x Sr 1- x )(Co 0.9 Al 0.1 )O 3-δ in which the perovskite occurred at a lower Ba concentration than the hexagonal polymorph. In addition, (Ba 0.9 Sr 0.1 )(Co 0.9 Y 0.1 )O 3-δ showed good oxygen permeability on a level similar to that of (Ba 0.5 Sr 0.5 )(Co 0.8 Fe 0.2 )O 3-δ .

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