Dielectric relaxation on Ba1−xBi2x/3Zr0.25Ti0.75O3 ceramic

► Perovskite-type cubic structure with space group Pm3m. ► ac conductivity obeys the Jonscher's universal power law. ► Space charge polarization is easy to activate thermally. ► Ba1−xBi2x/3Zr0.25Ti0.75O3 (x = 0.025) ceramic behaves like negative temperature coefficient of resistance (NTCR).