Abstract
The oxide-ion conductivity and crystal structure of the perovskite-type (Ba 1− x− y Sr x La y ) 2In 2O 5+ y solid-solution system, which was derived from Ba 2In 2O 5 with a brownmillerite-type structure, were investigated as a function of temperature and oxygen partial pressure. The oxide-ion conductivity was discussed from the viewpoint of the unit cell free volume. The oxide-ion transport number approached unity with increasing La content and the ion conductivity increased with the La or Sr content. The oxide-ion conductivity (1073 K) of (Ba 0.3Sr 0.2La 0.5) 2In 2O 5.5 exhibited a maximum value of 0.12 (S/cm), which exceeded that of yttria-stabilized zirconia. It was found that the oxide-ion conductivity of the present system was dominated by both the unit cell free volume and the amount of mobile oxide ion.
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