High energy-storage properties of Bi0.5Na0.5TiO3-BaTiO3-SrTi0.875Nb0.1O3 lead-free relaxor ferroelectrics
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2018年第12期
论文作者：Jing Shi Xiao Liu Wenchao Tian
文章页码：2371 - 2374
摘 要：New lead-free ferroelectric（0.94-x）Bio0.5Na0.5TiO3-0.06 BaTiO3-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-0.2 STN,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 ℃ 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.
Jing Shi1，Xiao Liu2，Wenchao Tian1
1. Key Laboratory of Electronic Equipment Structure Design (Ministry of Education),School of Mechano-Electronic Engineering,Xidian University2. College of Materials Science and Engineering,Xi’an University of Science and Technology
摘 要：New lead-free ferroelectric（0.94-x）Bio0.5Na0.5TiO3-0.06 BaTiO3-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-0.2 STN,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 ℃ 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.
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