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Samples of Ba β-Al 2 O 3 with the stoichiometries BaAl 9 O 15 to BaAl 14 O 22 were prepared by a solid state route from Al 2 O 3 and BaCO 3 . Samples of MgO-stabilised and ZrO 2 -added material were also prepared. After rationalising the calcining and sintering procedure to produce dense samples (99% of theoretical) such samples were then analysed by Impedance Spectroscopy. Differences in the Arrhenius plots e.g. activation energies for the different materials are shown. XRD patterns showed BaAl 9 O 15 and BaAl 14 O 22 to be single phase with the BaAl 12 O 19 material being a mixture of BaAl 9 O 15 and BaAl 14 O 22 .