High energy storage properties and dielectric temperature stability of (1-x)(0.8Bi0.5Na0.5TiO3-0.2Ba0.3Sr0.4TiO3)-xNaNbO3 lead-free ceramics

Perovskite structure (1-x)(0.8Bi(0.5)Na(0.5)TiO(3)-0.2Ba(0.3)Sr(0.4)TiO(3))-xNaNbO(3) (BNBST-xNN, x < 0.3) ceramics were fabricated by solid-state reaction method. The grain growth was suppressed after adding NaNbO3 into 0.8Bi(0.5)Na(0.5)TiO(3)-0.2Ba(0.3)Sr(0.4)TiO(3)) ceramic, and XRD patterns revealed that solid solutions were formed with NaNbO3 at 0-0.2. With the rising amount of NaNbO3, both relaxor characteristics and dielectric temperature stability were enhanced. The BNBST-0.1NN solid solution displayed a high recoverable energy storage density of 2.26 J/cm(3) with energy storage efficiency of 87.34% at 180 kV/cm and exhibited a short time of less than 1 mu s for discharged energy density reached to 90% of its saturated value. Furthermore, the ceramic for x = 0.1 displayed a permittivity of 2601 at 150 degrees C and showed a wide range from 20 to 300 degrees C for permittivity deviation Delta epsilon/epsilon(150 )degrees(C) less than +/- 15%, exhibiting a superior thermal stability of permittivity. In addition, a reduction around 5% in W-dis after 10(6) cycles indicated its excellent fatigue characteristics. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

Perovskite ceramic materials with a BNBST-xNN composition were fabricated using a solid-state reaction method. The addition of NaNbO3 suppressed grain growth and enhanced relaxor characteristics and dielectric temperature stability. The BNBST-0.1NN solid solution exhibited high recoverable energy storage density, excellent fatigue characteristics, and superior thermal stability of permittivity.