Enhanced oxide ion conductivity in stabilized cubic BaInO2.5 by Mn5 + doping

The preparation of room-temperature stabilized cubic BaInO2.5 was successfully achieved by adjusting Mn5 + doping (0.13 ≤ x ≤ 0.33) using high-temperature solid state reactions. XPS and magnetic investigations revealed that the valence state of Mn ions in stabilized cubic BaInO2.5 was + 5. The stabilized cubic BaInO2.5 showed enhanced oxide ion conductivity, and the best low-temperature conductivity at 400 °C was 3.0 × 10− 3 S cm− 1, which was larger than previously reported highest conductivity for stabilized cubic BaInO2.5.