AC Electric Conductivity of Noncrystalline Film from the TiO2 System with CaO, BaO, MgO and Al2O3

Non-crystalline films were prepared by the twin-roller quenching of the systems of TiO2with CaO, BaO, MgO and Al2O3. Electrical conductivities of these non-crystalline films and their changes on heating were measured by the complex impedance method within the frequency range between 500 kHz and 100 Hz. Electrical conductivities of the non-crystalline films were about two orders of magnitude smaller than those of their corresponding crystalline forms. Crystallization induced a remarkable change in the relation between complex impedance and frequency.