An effective optimization strategy and analysis for BaTiO3-Na0.5Bi0.5TiO3 system with colossal permittivity

By using defect engineering, a Nb-doped BaTiO3 ceramics with stable colossal permittivity (εr =1.3×104 at 1 kHz and room temperature)，high bulk resistivity (>1010 Ω·cm) as well as relative low dielectric loss (tanδ~0.06) has been obtained over a wide temperature range of −55-150 °C, satisfying IEA X8R specification, which has a potential application prospect in high capacity solid supercapacitor.