Design of a KNN-BZT Ceramic with High Energy Storage Properties and Transmittance under Low Electric Fields

With the advancement of science and technology, single-function ceramics have been difficult to meet the rapid development of electronic components. It is of great significance to find and develop multifunctional ceramics with excellent performance and environmental friendliness (such as good energy storage and transparency). Especially, the realization of its excellent performance under low electric fields has more reference and practical value. In this study, by Bi(Zn_0.5Ti_0.5)O₃ (BZT) modification in (K_0.5Na_0.5)NbO₃ (KNN), reducing grain size, and increasing band gap energy, the purpose of improving energy storage performance and transparency has been achieved under low electric field. The results show that the submicron average grain size decreased to 0.9 μm and the band gap energy (E _g) increased to 2.97 eV for 0.90KNN-0.10BZT ceramics. The transparency is up to 69.27% in the near-infrared region (1344 nm) and the energy storage density is 2.16 J/cm³ under 170 kV/cm. Moreover, the 0.90KNN-0.10BZT ceramic exhibits a power density (P _D) of 17.50 MW/cm³ and the stored energy can be discharged in 1.60 μs at 140 kV/cm. This revealed a potential application of KNN-BZT ceramic as an energy storage and transparent capacitor in the electronics industry.