Energy Storage Performance of (Na0.5Bi0.5)TiO3 Relaxor Ferroelectric Film

The (Na0.5Bi0.5)TiO3 relaxor ferroelectric materials have great potential in high energy storage capacitors due to their small hysteresis, low remanent polarization and high breakdown electric field. In this work, (Na0.5Bi0.5)TiO3 thin films with similar to 400 nm were prepared on (001) SrTiO3 substrate by pulsed laser deposition technology. The (Na0.5Bi0.5)TiO3 films have good crystallization quality with a dense microstructure and relaxor ferroelectric properties, as confirmed by the elongated hysteresis loops and the relation of <A>proportional to E-alpha. A high E-b of up to 1400 kV/cm is obtained, which contributes to a good W-rec of 24.6 J/cm(3) and eta of 72% in (Na0.5Bi0.5)TiO3 film. In addition, the variations of W-rec and eta are less than 4% and 10% in the temperature range of 20-120 degrees C. In the frequency range of 10(3) Hz-2 x 10(4) Hz, the variations of W-rec and eta are less than 10%. All those reveal the great potential of NBT film for energy storage.