High energy storage density with ultra-high efficiency and fast charging–discharging capability of sodium bismuth niobate lead-free ceramics

Ceramics-based capacitors with excellent energy storage characteristics, fast charging/discharge rate, and high efficiency have received significant attention. In this work, Na 0 . 7 3 Bi 0 . 0 9 NbO3(NBN) ceramics were processed through solid-state sintering route. The investigated ceramics were crystallized in a single perovskite phase. Dense microstructure, with small average grain size ( ∼ 0.92 μ m) is obtained for the investigated ceramics. A high dielectric constant > 1000 accompanied by a low dielectric loss was achieved for these ceramics at ambient temperature. A recoverable energy density ∼ 0.92 J/cm3and ultra-high efficiency of 96.33% at 138 kV/cm were obtained at room temperature. Furthermore, a lower discharging time of 0.14 μ s was also achieved. This material is a suitable candidate for power pulsed applications.