Enhanced electrical energy storage properties in La-doped (BiNa)BaTiO lead-free ceramics by addition of LaO and La(NO).

Lead-free [(BiNa)Ba]LaTiO (BNBLT) ceramics for energy storage application were prepared by traditional solid-state reaction technique, and the La ions doping content was varied at 0 ≤ x ≤ 0.04. The BNBLT ceramics showed single-phase perovskite structure without impurity phase. Compact and uniform microstructure with fine grain size was obtained. The remanent polarization and coercive field decreased with the increase in La ions doping content, and the energy storage density increased drastically. The maximum energy storage density of the BNBLT ceramics at x = 0.04 was 1.09 J/cm by using LaO powders and can be further increased to 1.21 J/cm using La(NO) powders, and meanwhile, the breakdown field strength increased obviously. Anti-ferroelectric-like behavior with a double pinched P- E hysteresis loop was observed in La-doped BNBLT ceramics at room temperature, which is promising candidate for energy storage dielectric ceramic. [ABSTRACT FROM AUTHOR]