Structural, transmittance, ferroelectric, energy storage, and electrical properties of K0.5Na0.5NbO3 ceramics regulated by Sr(Yb0.5Ta0.5)O3

High transparent lead-free (1-x)K0.5Na0.5NbO3-xSr(Yb0.5Ta0.5)O-3 (KNN-xSYbT, x = 0.005, 0.01, 0.02, 0.03, 0.04, 0.05) ferroelectric ceramics were synthesized by the conventional solid-phase sintering method. The effects of Sr(Yb0.5Ta0.5)O-3 doping on the microstructure, phase transition, optical and electrical properties were investigated. At x = 0.01, an excellent transmittances of 52.3% in the visible region and 68.2% in the infrared region was achieved, and the optical bandgap E-g was 3.00 eV. X-ray diffraction indicates that the crystal structure of the ceramics transformed from orthorhombic phase to pseudo-cubic phase with doping of Sr(Yb0.5Ta0.5)O-3. After introduction of Sr(Yb0.5Ta0.5)O-3, the grain size of the ceramics changes obviously and the grains become smaller gradually. The ceramics with x = 0.01 exhibited the optimal energy storage properties with W-rec = 0.55 J/cm(3) and eta = 61.1%. The maximum dielectric constant of 3300 was obtained at x = 0.005. The results illustrated that the proposed system has a broad application prospect in multi-functional integrated devices.