Semiconductor/relaxor 0-3 type composites without thermal depolarization in Bi 0.5 Na 0.5 TiO 3-based lead-free piezoceramics

Ji Zhang, Zhao Pan, Fei Fei Guo, Wen Chao Liu, Huanpo Ning, Y. B. Chen, Ming Hui Lu, Bin Yang, Jun Chen, Shan Tao Zhang, Xianran Xing, Jürgen Rödel, Wenwu Cao, Yan Feng Chen

Research output: Contribution to journalArticlepeer-review

290 Scopus citations


Commercial lead-based piezoelectric materials raised worldwide environmental concerns in the past decade. Bi 0.5 Na 0.5 TiO 3-based solid solution is among the most promising lead-free piezoelectric candidates; however, depolarization of these solid solutions is a longstanding obstacle for their practical applications. Here we use a strategy to defer the thermal depolarization, even render depolarization-free Bi 0.5 Na 0.5 TiO 3-based 0-3-type composites. This is achieved by introducing semiconducting ZnO particles into the relaxor ferroelectric 0.94Bi 0.5 Na 0.5 TiO 3-0.06BaTiO 3 matrix. The depolarization temperature increases with increasing ZnO concentration until depolarization disappears at 30 mol% ZnO. The semiconducting nature of ZnO provides charges to partially compensate the ferroelectric depolarization field. These results not only pave the way for applications of Bi 0.5 Na 0.5 TiO 3-based piezoceramics, but also have great impact on the understanding of the mechanism of depolarization so as to provide a new design to optimize the performance of lead-free piezoelectrics.

Original languageEnglish (US)
Article number6615
JournalNature communications
StatePublished - Mar 19 2015

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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