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The ferroelectric, lead-free perovskite sodium bismuth titanate-barium titanate (BNT-BT) has excellent electrical performance and is now recognized as a possible alternative material for lead zirconate titanate (PZT). It can be doped with some active elements to form a solid solution with a morphotropic phase boundary (MPB), where the solid solution has high dielectric properties and high energy storage performance. In this paper, the research results of BNT-BLT, BNT-BLZT, BNT-BSLZT, BNT-BMNLT and BNT-BST-KNN ceramic materials are summarized, and the influence of their doping mode on the phase structure and electrical properties are analyzed. The study found a rhombohedral and tetragonal phase coexistence region, where the tolerance factor value of ceramics is between 0.7530 and 0.7803. Moreover, the energy storage density of antiferroelectric ceramics increases with the expansion of the MPB region and is affected by the dielectric constant. [ABSTRACT FROM AUTHOR]

[(Bi1/2Na1/2)0.92Ba0.05La0.02](Mg1/3Nb2/3)xTi(1-0.5x)O3(BNT-BLMNT, x = 0.01, 0.03,0.05,0.07) lead-free anti-ferroelectric ceramics were synthesized by a conventional solid-state. The effects of B-doped Mg4Nb2O9 groups on phase structures, compositional distribution and electrical properties of BNT-BLMNT ceramics were systematically investigated to further understand the mechanism of phase transition.It was found that the grain size of ceramic materials tends to decrease and the distribution becomes more uniform, indicating that Mg4Nb2O9 is conducive to the synthesis of ceramic materials in this system and effectively improves the grain size and distribution of this material with the increase of B-doped Mg4Nb2O9 group content. According to SEM and XRD analysis, Mg4Nb2O9 was completely dissolved in the ceramic crystal, forming a solid solution, all of which were of a single perovskite crystal structure.With the increase of it's content, the remnant polarization (Pr) decreased significantly, from 38.9 µC/cm2(x = 0.01) to 10.4 µC/cm2(x = 0.05), and the difference between the maximum polarization(Pmax) and the remnant polarization(Pr) became larger and larger, indicating that the addition of Mg and Nb elements increased the transition trend of the anti-ferroelectric phase. [ABSTRACT FROM AUTHOR]

[(Bi1/2Na1/2)0.94Ba0.06](1–1.5x)LaxTiO3(BNT-BLT, x = 0, 0.02, 0.04, 0.06) lead-free anti-ferroelectric ceramics were synthesized by a conventional solid-state reaction method. The microstructure and the electrical properties of BNT-BLT were investigated. The X-ray diffraction patterns reveal that the BNT-BLT ceramic is constituted by a single perovskite structure phase. The average grain size of the ceramic samples gradually decreases with increasing La content, reducing the ferroelectric properties of the material and enhancing its anti-ferroelectric properties. TheP-Ehysteresis loops of BNT-BLT ceramics at an electric field of 36 kV/cm indicate that both the saturation polarization (Ps) and the remnant polarization (Pr) decrease as the La doping increases. These properties indicate that BNT-BLZT ceramics are a promising lead-free anti-ferroelectric material for applications in energy-storage capacitors. [ABSTRACT FROM PUBLISHER]

[(Bi1/2Na1/2)0.92Ba0.05La0.02][SnxZr(0.95-x)Ti0.05]O3(BNT-BLSZT, x = 0, 0.03, 0.06, 0.09) lead-free ferroelectric ceramics synthesized by a conventional solid-state reaction method exhibit high crystallinity and high density at 1150°C. The microstructure and the electrical properties of BNT-BLSZT were investigated. The X-ray diffraction patterns reveal that the BNT-BLSZT ceramic is constituted by a single perovskite structure phase. The average grain size of the ceramic samples slightly increases with increasing Sn content, TheP-Ehysteresis loops of BNT-BLZST ceramics at 50 kV/cm indicate that both the saturation polarization (Ps) and the remnant polarization (Pr) decrease with increasing Sn-doping. It shows that Sn-doping is useful to improve energy storage density of the ceramics. These properties indicate that BNT-BLZST ceramics are a promising lead-free anti-ferroelectric material for applications in energy-storage capacitors. [ABSTRACT FROM PUBLISHER]

(Bi0.46Na0.46Ba0.05La0.02)ZrxTi(1-x)O3(BNBLZT,x= 0.01, 0.03, 0.05, 0.07) lead-free anti-ferroelectric ceramics were synthesized by conventional solid-state reaction method. Microstructures and electrical properties of BNBLZT were investigated. Calculation from the X-ray diffraction results reveals that BNBLZT ceramic possesses a single perovskite structure phase. All BNBLZT ceramics show high density and the grain sizes decrease slightly with the addition of Zr concentration. In addition, theP-Ehysteresis loops measured at room temperature show that the largest energy-storage densityWmaxis 1.89 J/cm3. The temperature dependence of dielectric permittivity ϵrand dielectric loss tanδ illustrate that the addition of Zr can improve the piezoelectric properties of BNBLZT ceramics. [ABSTRACT FROM PUBLISHER]