The Ba(Bi0.5Ta0.5)O3 modified (K0.5Na0.5)NbO3 lead-free transparent ferroelectric ceramics with high transmittance and excellent energy storage performance

For solving the contradiction that good optical properties and electrical properties of (K0.5Na0.5)NbO3 (KNN)-based transparent ferroelectric ceramics cannot be achieved at the same time. The modification by doping and improved sintering techniques can not only increase the optical properties of ceramics but also improve and enhance the electrical properties of ceramics. (1 - x)(K0.5Na0.5)NbO3-xBa(Bi0.5Ta0.5)O-3 (x = 0.01, 0.015, 0.02, 0.025, 0.03) lead-free transparent ferroelectric ceramics were synthesized by conventional solid-phase sintering method. The KNN ceramic was modified by Ba(Bi0.5Ta0.5)O-3 to obtain a large optical band gap energy, submicron grains, and a highly symmetric phase structure when x = 0.025, thus gaining highly transmittance of 67.2% in near-infrared region. The smaller grain size and dense microstructure give the ceramic with x = 0.025 a higher dielectric breakdown strength. Therefore, the excellent energy storage performance is achieved at high electric field of 200 kV/cm with energy storage density (W-rec) and energy storage efficiency (eta) of 1.41 J/cm(3) and 42%, respectively. The results show that (K0.5Na0.5)NbO3-Ba(Bi0.5Ta0.5)O-3 ceramics are considered to be excellent candidates for the field of new transparent electronic devices.

Automated summary

By doping and improving sintering techniques, both the optical and electrical properties of (K0.5Na0.5)NbO3-Ba(Bi0.5Ta0.5)O-3 ferroelectric ceramics have been enhanced, making them excellent candidates for new transparent electronic devices.