Abstract
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 (Pr), maximum polarization (Pm), and Pm-Pr 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 Pm and the large Pma-Pr value, the highest recoverable energy-storage density (Jreco) gets the value of 2.9 J/cm3. The obtained results indicate that the BNKT films have application potentials in advanced capacitors.
Highlights
People have faced big global challenges such as the air pollution, climate change, and the energy scarcity
The Bi0.5(Na0.80,K0.20)0.5TiO3 (BNKT) thin films were formed on Pt/Ti/SiO2/Si substrates by a sol-gel technique
Rrms possesses the values of 5.5, 4.8, 4.6, and 3.8 nm corresponding to the BNKT films: T10, T20, T40, and T60
Summary
People have faced big global challenges such as the air pollution, climate change, and the energy scarcity. The development of the high energy-storage materials and devices has been paid increasing attention. The dielectric capacitors owning numerous good properties such as ultrafast charge-discharge rate, high energy-storage density (Jreco), good temperature stability, and low cost have been widely studied in the past decades. They have been used in a lot of modern electrical equipment, such as high power microwaves and electromagnetic armor. Lead-free ceramics, such as (K0.5Na0.5)NbO3 (KNN)-based [13], BaTiO3 (BT)based [14], SrTiO3 (ST)-based [3], and (Bi0.5Na0.5)TiO3 (BNT)-based [15], have attracted much attention because of their good energy-storage properties. Leadfree (Na0.5Bi0.5)TiO3 (NBT) ferroelectric materials have been
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