Abstract
The Sr0.5Ba0.5Nb2O6 (SBN) dielectric ceramics with different SrO–B2O3–SiO2 (SBS) glass content were prepared via solid state reaction method. The effect of glass content on their sintering temperature, density, microstructure, dielectric and energy storage properties was investigated. The addition of glass was confirmed to be effective in reducing sintering temperature and refining microstructure. The XRD results showed that no secondary phase was formed after adding glass, but Sr2+ might diffuse into SBN lattice during the thermal heat-treatment. The dielectric breakdown strength (BDS) of SBN ceramic was remarkably enhanced with 4 wt% glass addition, which is almost twice as much as that of pure SBN ceramic. This sample also presented a large discharge energy density of 0.55 J/cm3 and high energy efficiency of 72.4%. These results indicate the addition of SBS glass significantly improved the microstructures, dielectric and energy storage properties of SBN ceramics.
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