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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]

Enhancing the availability and reliability of dielectric ceramic energy storage devices is of great importance. In this work, (1- x) Na 0. 5 Bi 0. 5 TiO 3 – x Bi( Mg 0. 5 Hf 0. 5 ) O 3 (NBT– x BMH) lead-free ceramics were created utilizing a solid-state reaction technique. All NBT– x BMH ceramics have a single perovskite structure. With increasing BMH doping, the grain size shrinks drastically, which greatly enhances the breakdown electric field (310 kV/cm at x = 0.25). Additionally, the relaxation behaviors of NBT– x BMH ceramics with high BMH content are more remarkable. Among all designed components, the NBT–0.25BMH ceramic exhibits the best energy storage performance with a high W rec of 4.63 J/ cm 3 and an η of 75.1% at 310 kV/cm. The NBT–0.25BMH ceramic has exceptional resistance to fluctuations in both frequency (5–500 Hz) and temperature (30–100 ∘ C). Charge–discharge test shows that the NBT–0.25BMH ceramic has a quick discharge rate ( t 0. 9 < 110 ns). With these properties, the NBT–0.25BMH ceramic may have applications in microdevices as well as in ultra-high power electronic systems. [ABSTRACT FROM AUTHOR]