NaNbO3-based ultra-high energy storage ceramics with linear polarization

With the rapid advancement of electronic devices, the demand for capacitors with high energy storage steadily increases. Researchers are constantly searching for dielectrics that possess both high energy density and high energy efficiency. Using phase-field simulations, we found that cubic phase structures exhibiting linear polarization behavior have higher energy storage potential. Based on the simulation results, Sr 0.7 Bi 0.2 TiO 3 relaxors are introduced into the 0.88NaNbO 3 –0.12Bi(Mg 2/3 Ta 1/3 )O 3 matrix to stabilize the cubic phase structure while enhancing polarization strength through orbital hybridization between Bi and O. Finally, a high-energy ball milling process is utilized to refine the grain size, fully exploiting its energy storage potential. In the 0.68NaNbO 3 –0.12Bi(Mg 2/3 Ta 1/3 )O 3 –0.20Sr 0.7 Bi 0.2 TiO 3 composition, an energy density of 10.1 J/cm 3 and an energy efficiency of 88% are achieved, along with excellent temperature stability, frequency stability, and high fatigue resistance, these results are significant for improvement of energy storage dielectrics. • Phase Field simulation guided structural design of energy storage ceramics. • Constructing cubic phase NaNbO 3 ceramics promotes linear growth of polarization. • High-energy ball milling optimizes the grain size to enhance E b . • Enhanced hybridization between Bi and O maintains polarization stability.