Enhanced electrical energy storage properties in La-doped (Bi0.5Na0.5)0.93Ba0.07TiO3 lead-free ceramics by addition of La2O3 and La(NO3)3
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Lead-free [(Bi0.5Na0.5)0.93Ba0.07]1−x La x TiO3 (BNBLT) ceramics for energy storage application were prepared by traditional solid-state reaction technique, and the La3+ 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 La3+ 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/cm3 by using La2O3 powders and can be further increased to 1.21 J/cm3 using La(NO3)3 powders, and meanwhile, the breakdown field strength increased obviously. Anti-ferroelectric-like behavior with a double pinched P–E hysteresis loop was observed in La3+-doped BNBLT ceramics at room temperature, which is promising candidate for energy storage dielectric ceramic.
This work is supported by the National Nature Science Foundation of China (11664006), Guangxi Nature Science Foundation (2016GXNSFAA380069) and Guangxi Key Laboratory of Information Materials (151017-Z, 161001-Z).
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