Dielectric relaxation behavior and energy storage properties in Ba0.4Sr0.6Zr0.15Ti0.85O3 ceramics with glass additives

Ba0.4Sr0.6Zr0.15Ti0.85O3 ceramics with SrO–B2O3–SiO2 glass additives were prepared via the solid state reaction route. The effects of glass contents on the sintering behavior, dielectric properties, microstructures, and energy storage properties of BSZT ceramics were investigated. Dielectric breakdown strength of 22.4 kV/mm was achieved for BSZT ceramics with 20 wt% glass addition. Dielectric relaxation behavior was observed in dielectric loss versus temperature plots. In order to investigate the mechanism of dielectric breakdown performance, the relationship between dielectric breakdown strength and grain boundary barrier was studied by the measurements of breakdown strength and activation energy. A discharged energy density of 0.45 J/cm3 with an energy efficiency of 88.2% was achieved for BSZT ceramics with 5 wt% glass addition.