Effects of SrO-B_2O_3-SiO_2 glass additive on densification and energy storage properties of Ba_(0.4)Sr_(0.6)TiO_3 ceramics

摘要

SrO-B_2O_3-SiO_2 glass powders were prepared and employed as sintering aids to reduce the sintering temperature of Ba_(0.4)Sr_(0.6)TiO_3 ceramics. The effects of glass content and sintering temperature on the densifica-lion, dielectric properties and energy storage properties of Ba_(0.4)Sr_(0.6)TiO_3 ceramics have been investigated. The relative density characterization results indicate that densification of Ba_(0.4)Sr_(0.6)TiO_3 ceramics with glass content becomes apparently from sintering temperature of 1,060 ℃. XRD results show all Ba_(0.4)Sr_(0.6)TiO_3 ceramics exhibit a perovskite structure without the formation of a secondary phase. The dielectric constant and dielectric loss decreased gradually with increasing glass content. The relationship between dielectric constant and breakdown strength was discussed using the thermochemical model. A discharged energy density of 0.44 J/cm~3 with an energy efficiency of 67.4% was achieved for Ba_(0.4)Sr_(0.6)TiO_3 ceramic with 2.0 wt% glass addition sintered at 1,180 ℃.