Abstract
We synthesized BaIn 1− x Co x O 3− δ ( x = 0–0.8) with a defective perovskite structure by partly replacing In with Co in Ba 2In 2O 5. Based on XRD measurements, the synthesized compound was found to have cubic perovskite and orthorhombic brownmillerite structures depending on the amount of Co. BaIn 1− x Co x O 3− δ ( x = 0.2 and 0.3) showed high total electrical conductivities without undergoing the structural transformation that the original Ba 2In 2O 5 undergoes. Some of the samples showed both electronic and oxide ionic conductivities. At the same time, the oxide ionic conductivity was comparable with that of Ba 2In 2O 5. For example, the sample with x = 0.1 had a total electrical conductivity of 4.7 × 10 − 1 S cm − 1 and an oxide ion transport number of 0.52 at 850 °C.
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