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Na 0.5 Bi 0.5 TiO 3 (NBT) ceramic is a potential dielectric material for the manufacture of high-performance dielectric ceramic capacitors due to its high polarization and environmentally friendly characteristics. In this work, (1– x)(0.70Na 0.5 Bi 0.5 TiO 3 –0.30SrTiO 3)– x Bi(Ni 0.5 Hf 0.5)O 3 (NBST– x BNH) ceramics have been prepared based on the strategy of refining grain size and inducing polar nano-regions (PNRs). As a result, the NBST–0.15BNH ceramic achieved large energy density and efficiency (W rec = 4.11 J/cm3, η = 82.1%) at a low electric field of 240 kV/cm. This performance is outstanding compared to existing reports at similar breakdown electric fields. The introduction of Sr2+ enabled the NBST to have a high relaxation property, and the introduction of BNH induced PNRs, which ensured the high energy storage efficiency of the ceramics. BNH doping refined grain size, which contributed to the large breakdown electric field strength of the ceramics. In addition, stability tests showed that the NBST–0.15BNH ceramic had excellent thermal and frequency stability. The ceramic also demonstrated a fast discharge rate (t 0.9 = 148 ns) in the charge-discharge test. [Display omitted] [ABSTRACT FROM AUTHOR]

Na 0.5 Bi 0.5 TiO 3 (NBT) ceramic is a potential dielectric material for the manufacture of high-performance dielectric ceramic capacitors due to its high polarization and environmentally friendly characteristics. In this work, (1– x)(0.70Na 0.5 Bi 0.5 TiO 3 –0.30SrTiO 3)– x Bi(Ni 0.5 Hf 0.5)O 3 (NBST– x BNH) ceramics have been prepared based on the strategy of refining grain size and inducing polar nano-regions (PNRs). As a result, the NBST–0.15BNH ceramic achieved large energy density and efficiency (W rec = 4.11 J/cm3, η = 82.1%) at a low electric field of 240 kV/cm. This performance is outstanding compared to existing reports at similar breakdown electric fields. The introduction of Sr2+ enabled the NBST to have a high relaxation property, and the introduction of BNH induced PNRs, which ensured the high energy storage efficiency of the ceramics. BNH doping refined grain size, which contributed to the large breakdown electric field strength of the ceramics. In addition, stability tests showed that the NBST–0.15BNH ceramic had excellent thermal and frequency stability. The ceramic also demonstrated a fast discharge rate (t 0.9 = 148 ns) in the charge-discharge test. [Display omitted] [ABSTRACT FROM AUTHOR]

• 0.80NN-0.20BNH ceramic achieved large W rec of 6.45 J/cm3 and an η of 82.72 %. • 0.8NN-0.2BNH ceramics displayed high power density (P D = 215 MW/cm3). • 0.8NN-0.2BNH ceramics displayed large current density (C D = 1346 A/cm2). • 0.8NN-0.2BNH ceramics show excellent stability of frequency and temperature. (1- x)NaNbO 3 - x Bi(Ni 0.5 Hf 0.5)O 3 [(1- x)NN- x BNH, x = 0.10, 0.15, 0.20 and 0.25] lead-free ferroelectric ceramics were fabricated via a standard solid-phase reaction method, in order to obtain superior energy storage properties. BNH is introduced into the NN lattice to limit grain growth and improve the breakdown field strength as a second component. As the results indicate, a high W rec of 6.45 J/cm3 and a breakdown field strength (E b) of 380 kV/cm were achieved for the 0.80NN-0.20BNH ceramic, which was dependent on the nonequivalent replacement at the B site. In addition, the ceramics maintain significant stability over a frequency range of 10 Hz to 1000 Hz and temperature intervals from 30 up to 120 °C. Exceptional charge/discharge properties of high power density (P D = 215 MW/cm3) and current density (C D = 1346 A/cm2) along with an ultra-fast discharge rate (54 ns) were acquired. These results demonstrate that the 0.80NN-0.20BNH ceramic is an energy storage material with high potential. [ABSTRACT FROM AUTHOR]