• Dielectric properties and relaxation of Bi0.5Na0.5TiO3–BaNb2O6 lead-free ceramics

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    • Keywords

       

      Diffusion phase transitions; dielectric properties; relaxor characteristics.

    • Abstract

       

      A new member of lead-free piezoelectric ceramics of the BNT-based group, (1 – 𝑥)Bi0.5Na0.5TiO$_{3}–x$ BaNb2O6, was prepared by conventional solid state reaction and its dielectric properties and relaxation was investigated. X-ray diffraction showed that BaNb2O6 diffused into the lattice of Bi0.5Na0.5TiO3 to form a solid solution with perovskite-type structure. A diffuse character was proved by the linear fitting of the modified Curie–Weiss law. The temperature dependence of dielectric constant at different frequencies revealed that the solid solution exhibited relaxor characteristics different from classic relaxor ferroelectrics. The samples with 𝑥 = 0.002 and 0.006 exhibited obvious relaxor characteristics near the low temperature dielectric abnormal peak, 𝑇f, and the samples with 𝑥 = 0.010 and 0.014 exhibited obvious relaxor characteristics between room temperature and 𝑇f. The mechanism of relaxor behaviour was also discussed according to the macro-domain to micro-domain transition theory.

    • Author Affiliations

       

      Chang-Rong Zhou1 2 Xin-Yu Liu1 2

      1. Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin Guangxi 541004, China
      2. School of Material Science and Engineering, Central South University, Changsha Hunan 410083, China
    • Dates

       
  • Bulletin of Materials Science | News

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