AC impedance and gas concentration cell measurements for Ba12Y4.67Ti8O35

A ceramic phase Ba12Y4.67Ti8O35 was prepared by solid state reactions, the electrical properties of which were characterised by means of AC impedance spectroscopy, gas concentration cell as well as thermoelectric measurements. The measurements indicate that this material is an oxide ion/hole mixed conductor. At 700 degreesC, the bulk con, ductivity of die material is similar to 2 x 10(-3)Omega(-1) (.) cm(-1). The impedance data measured at 700 degreesC in air, O-2 and N-2 atmospheres were analysed by using computer curve fitting, which explains that the ion diffusion impedance is hidden in air and O-2 atmospheres because the oxide ion pathway is short circuited by electronic conduction.