Ba0.4Sr0.6TiO3/MgO Composites with Enhanced Energy Storage Density and Low Dielectric Loss for Solid‐State Pulse‐Forming Line

Abstract

(100−x) wt% Ba0.4Sr0.6TiO3−x wt% MgO composites (10≤x≤30) were prepared using Ba0.4Sr0.6TiO3 powder and nanosized MgO powder (∼60 nm) by a solid‐state reaction. The energy storage density and dielectric loss were investigated for the purpose of a potential application in solid‐state pulse‐forming line. The results show that Ba0.4Sr0.6TiO3/MgO composites exhibit a notably enhanced energy density and low dielectric loss, compared with pure Ba0.4Sr0.6TiO3. The enhancement of the energy density is attributed to the notable increase in breakdown strength of the composites and the improvement of dielectric constant stability with regard to electric field. In the case of x=30, the samples exhibited a breakdown strength of 33.1 kV/mm, an energy density of 1.14 J/cm3, a moderate dielectric constant of 270, and a low dielectric loss of 4 × 10−4.