Enhanced relaxation and energy storage performance in (Bi0.2Sr0.7)TiO3 modified AgNbO3 ceramics

The unique antiferroelectric behavior of AgNbO 3 ceramics has great potential for energy storage applications, which have attracted increasing attention. However, the relatively low recoverable energy storage density, energy efficiency and breakdown strength of AgNbO 3 ceramics severely limit their application in practice. In the present work, (Bi 0.2 Sr 0.7 )TiO 3 was introduced to improve the relaxation behavior in AgNbO 3 ceramics via two-step sintering, which contributed to a high breakdown strength of 580 kV/cm. A recoverable energy storage density of 7.8 J/cm 3 and an energy efficiency of 56 % were obtained in 0.90AgNbO 3 -0.10(Bi 0.2 Sr 0.7 )TiO 3 ceramics. Moreover, the benign energy storage performance could be maintained at elevated temperatures, variable frequencies and cyclings up to 10 5 . These results demonstrate the great potential of AgNbO 3 -based ceramics for energy storage applications.