High energy storage performance in Bi(Mg0.5Hf0.5)O3 modified NaNbO3-based ceramics

Environmental pollution and the energy crisis become more and more crucial and people are gradually committed to new energy storage dielectrics to ease the pressure. Environment-friendliness NaNbO3-based antiferroelectric ceramics have attracted increasing interest due to their high power density and fast charge-discharge rate. However, the dielectric breakdown strength, the recoverable energy storage density (Wrec) and efficiency (ŋ) under strong electric fields are challenges. In this study, Bi(Mg0.5Hf0.5)O3 was introduced into NaNbO3 matrix to fabricate (1 − x)NaNbO3-xBi(Mg0.5Hf0.5)O3 ceramics (abbreviated as (1 − x)NN − xBMH, x = 0.12, 0.16, 0.20, 0.24) via the rolling film method. The results show that the antiferroelectric R phase is stabilized and the relaxor behavior is also improved. High Wrec of 5.9 J/cm3 and ŋ of 89.9