Energy storage properties and transparency in (Ba0.6Sr0.4)1‐1.5xBixTi1‐x(Mg1/3Nb2/3)xO3 ceramics

Fully densified (transparent) ceramic with small grain size is highly desired to improve the field breakdown strength (BDS) and its scattering. Sintering behavior, microstructural evolution, electric, dielectric, and energy storage properties of (Ba0.6Sr0.4)1‐1.5xBixTi1‐x(Mg1/3Nb2/3)xO3 (x = .04–.10) ceramics have been studied in this paper. Phase pure cubic perovskite is observed for the x = .04 composition. Nb‐rich tungsten bronze type and Ti‐rich barium titanate secondary phases are present in the x > .05 compositions. A multiphasic transparent ferroelectric ceramic with ∼74.2% (780 nm) transmittance and a high refractive index of ∼2.3 within the visible region could be successfully obtained for the x = .10 composition by traditional ceramic process. The x = .09 composition demonstrates good energy storage performance (recoverable energy density Wrec = 3.74J/cm3, efficiency η = 77% and BDS = 390kV/cm) with extremely low scattering in BDS, suggesting potential application in large sized energy storage capacitor.