Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (12): 1330-1336.DOI: 10.15541/jim20180198

Special Issue: 介电储能陶瓷

• RESEARCH PAPER • Previous Articles     Next Articles

Energy Storage and Strain Property of (Bi0.5Na0.5)0.935Ba0.065TiO3-xBiScO3 Ceramics

LIU Guo-Bao1, WANG Hua1,2, XIE Hang1, PANG Si-Jian1, ZHOU Chang-Rong1,2, XU Ji-Wen1,2   

  1. 1. School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004;
    2. Guangxi Key Laboratory of Information Materials, Guilin University of Electronic Technology, Guilin 541004
  • Received:2018-04-27 Published:2018-12-20 Online:2018-11-27
  • About author:LIU Guo-Bao. E-mail: liuguobao77@163.com
  • Supported by:
    National Natural Science Foundation of China (11664006);Guangxi Natural Science Foundation (2016GXNSFAA380069);Guangxi Key Laboratory of Information Materials (161001-Z, 171009-Z)

Abstract:

(1-x)(Bi0.5Na0.5)0.935Ba0.065TiO3-xBiScO3 (BNBT-xBS) lead-free ceramics were fabricated by conventional ceramic sintering process and modified by BiScO3. Effects of BiScO3 content on microstructure, energy storage, field-induced strain and dielectric properties of BNBT-xBS ceramics were investigated. The results indicated that the structure of BNBT-xBS ceramics without impurity phase transferred from the co-existence phase of rhombohedral and tetragonal phase to pseudo-cubic phase. Average grain size of BNBT-xBS ceramics grew slightly with increment of doping content. The long-range ferroelectric order of BNBT-xBS ceramics was destroyed by BiScO3, which resulted in weak polarization. Meanwhile, the phase transition of BNBT-xBS ceramics was observed from a typical ferroelectric phase to relaxor phase. BiScO3 dopants improved energy storage and strain performance of ceramics as well, whose maximum energy storage density and high strain were 0.46 J/cm3 and 0.25% at 70 kV/cm. The dielectric constant decreased with doping content increasing. Relaxor ferroelectric characteristics were also verified by temperature-dependence dielectric spectra. The resistance of BNBT-xBS ceramics illustrated a negative temperature coefficient and excellent electrical insulativity below 450℃.

 

Key words: BNBT-xBS, energy storage, strain, lead-free, ceramics

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