Improved Breakdown Strength in (Ba 0.6 Sr 0.4 ) 0.85 Bi 0.1 TiO 3 Ceramics with Addition of CaZrO 3 for Energy Storage Application

(Ba 0.6 Sr 0.4 ) 0.85 Bi 0.1 TiO 3 ceramics doped with x wt%CaZrO 3 ( x = 0-10) were synthesized by solid-state reaction method. The effects of CaZrO 3 amount on the dielectric properties and structure of (Ba 0.6 Sr 0.4 ) 0.85 Bi 0.1 TiO 3 ceramics were investigated. X-ray diffraction results indicated a pure cubic perovskite structure for all samples and that the lattice parameter increased till x =5 and then slightly decreased. A homogenous microstructure was observed with the addition of CaZrO 3 . Dielectric measurements revealed a relaxor-like characteristic for all samples and that the diffusivity γ reached the maximum value of 1.78 at x =5. With the addition of CaZrO 3 , the dielectric constant dependence on electric field was weakened, insulation resistivity enhanced and dielectric breakdown strength improved obviously and reached 19.9 kV/mm at x =7.5. In virtue of low dielectric loss (tan δ<0.001 5), moderate dielectric constant ( ε r >1 500) and high breakdown strength ( E b >17.5 kV/mm), the CaZrO 3 doped (Ba 0.6 Sr 0.4 ) 0.85 Bi 0.1 TiO 3 ceramic is a potential candidate material for high power electric applications.