Dielectric, impedance, and energy storage properties of Bi(Mg _0.5 Sn _0.5 )O ₃ modified Bi _0.5 Na _0.5 TiO ₃ based ceramics

Abstract (1– x )(0.60eBi _0.5 Na _0.5 TiO ₃ –0.35SrTiO ₃ –0.05BiFeO ₃ )– x Bi(Mg _0.5 Sn _0.5 )O ₃ ( x = 0.00, 0.05, 0.10, 0.15, and 0.20) ceramics processed via a solid‐state sintering route were investigated. Analysis of XRD data revealed the formation of the parent phase along with a minor secondary phase for each ceramic composition. The doping of BMS led to a decrease in the dielectric loss (tanδ ≤3%) for the composition with x = 0.10 in the temperature range 25°C–400°C. The observed small grain size of the sample with x = 0.10 may be responsible for its lower electrical conductivity which enhanced the energy storage performance. Furthermore, the overall resistance of all the compositions decreased with an increase in temperature which indicated a semiconducting behavior. For the sample with x = 0.10, enhancement in the overall properties was observed, i.e., stored energy density (W _s ) ∼2.67 J/cm ³ , recoverable energy density (W _rec ) ∼1.691 J/cm ³ and efficiency (η) ∼63% at a dielectric breakdown strength (BDS) ∼200 kV/cm. This composition may be suitable as an energy storage capacitor for pulsed power applications.