Sintering behavior and enhanced energy storage performance of SnO2-modified Bi0.5(Na0.8K0.2)0.5TiO3 lead-free ceramics

In the present study, SnO 2 -modified Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 (BNKT) ceramics were fabricated by the conventional solid-state reaction. In order to adjust its sintering behavior and energy storage properties of BNKT ceramics, SnO 2 doping contents varied at 0.0 ÷ 0.04 M. A suitable amount of SnO 2 improved the dielectric properties, affected the relaxor behavior, reduced the energy loss, and also optimized the energy storage performance of BNKT ceramics. Especially, the optimized synthesis procedure for SnO 2 -modified Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 ceramics resulted in enhanced the energy storage density of 300% and the energy storage efficiency of 59.1%, respectively. The results suggest that lead-free SnO 2 -modified Bi 0.5 (Na 0.8 K 0.2 ) 0.5 TiO 3 ceramics should be good candidates for energy storage applications in the future.