Lead-free Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) ferroelectric films were synthesized on Pt/Ti/SiO2/Si substrates via chemical solution deposition. The influence of crystallization time on the microstructures and ferroelectric and energy-storage properties of the films was investigated in detail. The XRD analysis showed that the BNKT films have well crystallized corresponding to the single-phase perovskite structure at 700°C. Ferroelectric and energy-storage properties of the films were significantly enhanced by increasing crystallization time. With crystallization time of 60 min, the remnant polarization ( ), maximum polarization ( ), and - values reached the highest values of 7.9 µC/cm2, 28.9 µC/cm2, and 21.0 µC/cm2, respectively, under the electric field of 400 kV/cm. Thanks to the strong enhancement in and the large - value, the highest recoverable energy-storage density ( ) gets the value of 2.9 J/cm3. The obtained results indicate that the BNKT films have application potentials in advanced capacitors.

中文翻译：

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结晶时间对无铅Bi0.5(Na0.8K0.2)0.5TiO3薄膜储能密度和效率的影响

通过化学溶液沉积在 Pt/Ti/SiO2/Si 衬底上合成了无铅 Bi0.5(Na0.80K0.20)0.5TiO3 (BNKT) 铁电薄膜。详细研究了结晶时间对薄膜微观结构、铁电和储能性能的影响。XRD 分析表明 BNKT 薄膜在 700°C 下结晶良好，对应于单相钙钛矿结构。通过增加结晶时间，薄膜的铁电和储能性能显着增强。结晶时间为 60 min 时，在 400 的电场下，残余极化 ( )、最大极化 ( ) 和 - 值分别达到最高值 7.9 µC/cm2、28.9 µC/cm2 和 21.0 µC/cm2千伏/厘米。由于强大的增强和大 - 值，最高可回收储能密度 ( ) 为 2.9 J/cm3。所得结果表明BNKT薄膜在先进电容器中具有应用潜力。