The effects of CuO-doping on dielectric and piezoelectric properties of Bi0.5Na0.5TiO3-Ba(Zr,Ti)O3lead-free ceramics

H. Y. Tian, Kin Wing Kwok, H. L.W. Chan, C. E. Buckley

Research output: Journal article publicationJournal articleAcademic researchpeer-review

22 Citations (Scopus)


CuO-doped lead-free ceramics based on bismuth sodium titanate (Bi0.5Na0.5TiO3, BNT) and barium zirconate titanate (Ba(Zr0.07Ti0.93)O3, BZT) were prepared via a multi-step solid-state reaction process. The BNT-BZT with CuO dopant ceramics sintered at 1150-1180 °C for 2 h in air showed a pure perovskite structure. SEM images reveal that a small amount of CuO (<2 mol%) play a significant role on the microstructure to improve its sintering attributes, while it will degrade when the dopant is added beyond 2 mol%. The dielectric and piezoelectric properties of CuO-doped BNT-BZT ceramics were evaluated. At room temperature, the sample doped with 2 mol% CuO shows quite good properties such as a high piezoelectric constant (d33∼ 156.5 pC/N) and a high electromechanical coupling factor (kt∼ 52%). The depolarization temperature increased dramatically and the maximum permittivity temperature decreased slightly.
Original languageEnglish
Pages (from-to)9750-9755
Number of pages6
JournalJournal of Materials Science
Issue number23
Publication statusPublished - 1 Dec 2007

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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