Abstract: Impedance spectroscopy has been used to investigate the conduction mechanism in the high temperature ceramics 0.63(Bi_0.94La_0.06)(Ga_0.05Fe_0.95)O₃-0.37PbTiO₃(BLGF-PT). The analysis of impedance and modulus spectroscopy has revealed that the region of grains is the most resistive component in the sample. Also, the electrical properties of BLGFPT ceramics are demonstrated, which can be represented using a parallel combination of a resistor and a universal capacitor. Resistivity of grains extracted from complex impedance plots decrease with the increase of temperature, and the calculated activation energy Ea is 0.88 eV.

Key words: conduction mechanism, equivalent circuit, high temperature ceramic, impedance spectroscopy