• Correlation between temperature-dependent permittivity dispersion and depolarization behaviours in Zr4+-modified BiFeO3–BaTiO3 piezoelectric ceramics

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      https://www.ias.ac.in/article/fulltext/boms/038/07/1737-1741

    • Keywords

       

      High-temperature piezoelectric ceramics; conventional solid-state reaction; depolarization; permittivity frequency dispersion.

    • Abstract

       

      The correlation between permittivity frequency dispersion and depoling process upon heating was investigated in Zr4+-modified 0.75BiFeO3–0.25BaTiO3 (BF–BZT) ceramics. The temperature-dependent permittivity 𝜀r(𝑇) and the piezoelectric coefficient 𝑑33 for poled samples were measured under heating conditions to clarify the depolarization mechanism. The results indicate that the poling temperature plays a crucial role in the domains' alignment process, as expected. The temperature-dependent permittivity frequency dispersion and depolarization behaviours may have same origin. The aligned domains' break up into random state/nanodomains at depoling temperature (𝑇 d), which causes strong frequency dependence of the permittivity, simultaneously, induces the loss of piezoelectricity. It suggests that the temperature-dependent permittivity measurements method is a simple way to determine the depolarization temperature.

    • Author Affiliations

       

      Weidong Zeng1 Changrong Zhou1 Jianrong Xiao2 Jiafeng Ma2

      1. School of Material Science and Engineering, Guilin University of Electronic Technology, Guilin, Guangxi 541004, PR China
      2. College of Science, Guilin University of Technology, Guilin, Guangxi 541004, PR China
    • Dates

       
  • Bulletin of Materials Science | News

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