J. Mater. Sci. Technol. ›› 2018, Vol. 34 ›› Issue (12): 2371-2374.DOI: 10.1016/j.jmst.2018.06.008

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High energy-storage properties of Bi0.5Na0.5TiO3-BaTiO3-SrTi0.875Nb0.1O3 lead-free relaxor ferroelectrics

Jing Shia*(), Xiao Liub, Wenchao Tiana   

  1. a Key Laboratory of Electronic Equipment Structure Design (Ministry of Education), School of Mechano-Electronic Engineering, Xidian University, Xi’an, 710071, China;
    b College of Materials Science and Engineering, Xi'an University of Science and Technology, Xi'an, 710054, China
  • Received:2017-07-06 Revised:2017-12-27 Accepted:2018-04-28 Online:2018-12-20 Published:2018-11-15
  • Contact: Shi Jing

Abstract:

New lead-free ferroelectric (0.94-x)Bi0.5Na0.5TiO3-0.06BaTiO3-xSrTi0.875Nb0.1O3 (BNBT-STN, x = 0 and 0.2) are synthesized by using a solid state reaction process. In this work, an obvious evolution of dielectric relaxation behavior and slim P-E hysteresis loops with high Pmax and low Pr is observed for BNBT-0.2STN, indicating the dominant of ergodic relaxor phase with dynamic polar nano-regions (PNRs). A relatively large recoverable energy density (Wrec = 1.17 J/cm3) with high energy efficiency (η = 91%) is obtained. Furthermore, it shows small variation (9%) in the temperature range of 30-150 °C and fatigue-free behavior, which can be attributed to the absence of ferroelectric domain in the relaxor phase. The achievement of these characteristics provides that tailoring by B-site vacancies is a potential route when designing a new energy-storage system for BNT-based relaxor ferroelectric materials.

Key words: Lead-free, Bi0.5Na0.5TiO3, Energy storage, Relaxor