Impedance spectroscopy of polycrystalline materials based on the Aurivillius phase system Bi$_4$Ti$_{3}$O$_{12}$–BiFeO$_3$

The thickness effect of perovskite-like blocks Aurivillius phases Bi$_{m+1}$Fe$_{m-3}$Ti$_{3}$O$_{3m+3}$ on their electrical properties were investigated. It is shown that there exists the change in the conductivity of the Aurivillius phases for certain thicknesses of perovskite-like blocks, which correspond to a sharp decrease in their stability.