The ac conductivity and complex impedance of CuO-doped (Ba0.5Sr0.5)TiO3 ceramic

The AC conductivity and complex impedance spectroscopy of CuO-doped (Ba0.5Sr0.5)TiO3 ceramic were investigated. X-ray diffraction analysis showed that CuO-doped (Ba0.5Sr0.5)TiO3 has a perovskite structure without any pyrochlore phase. Frequency dependent dielectric permittivity was discussed at a different temperature range. The activation energy was calculated and discussed through the Arrehnius equation from the ac conductivity with different frequency plots. CuO-doped (Ba0.5Sr0.5)TiO3 ceramics have a negative temperature coefficient of resistivity. Dependence of impedance spectroscopy on frequency and temperature showed that the conduction process in the CuO-doped (Ba0.5Sr0.5)TiO3 ceramic follows the thermally activated conduction mechanism.

► In this research, we have succeeded to lower the sintering temperature of (Ba0.5Sr0.5)TiO3 ceramic by adding CuO dopants.
► CuO-doped (Ba0.5Sr0.5)TiO3 ceramic showed huge value of dielectric permittivity.
► AC conductivity and complex impedance spectroscopy of CuO-doped (Ba0.5Sr0.5)TiO3 ceramic were investigated to know the electrical properties.
► X-ray diffraction analysis showed that CuO-doped (Ba0.5Sr0.5)TiO3 has the perovskite structure without any pyrochlore phase.
► The dependence of the impedance spectroscopy on the frequency and temperature showed that the conduction process in the CuO-doped (Ba0.5Sr0.5)TiO3 ceramic follows the thermally activated conduction mechanism.