Abstract
BaBi 4Ti 3MO 14.5 (M=Ga, In and Sc), compounds that consist of intergrowths between the Aurivillius phase Bi 4Ti 3O 12 and brownmilleritelike-layers of BaMO 2.5 were synthesized and their oxygen ion conductivities were measured using complex impedance. All three materials display a discontinuity in Arrhenius plots of their ionic conductivity. A phase transition at this discontinuity is confirmed by differential thermal analysis and is consistent with an oxygen vacancy order-disorder transition. For BaBi 4Ti 3ScO 14.5 there is an observed hysteresis for this phase transition. At 900°C the conductivities are 2.5×10 2 S·cm −1 for BaBi 4Ti 3ScO 14.5 and 4.9×10 −2 S·cm −1 for BaBi 4Ti 3InO 14.5 and 4.5×10 −2S·cm −1 for BaBi 4Ti 3GaO 14.5.
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