Properties of Co-doped 0.92(Na0.5Bi0.5) TiO3-0.08BaTiO3lead-free ceramics

Xiang Ping Jiang, Yan Yan Zheng, Fu Lan Jiang, Li Hua Liu, Kin Wing Kwok, Lai Wa Chan-Wong

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12 Citations (Scopus)

Abstract

Lead-free piezoelectric ceramics 0.92(Bi0.5Na0.5)TiO3-0.08BaTiO3+xmol% Co3+(BNBT-Co, x = 0-8) are prepared by the solid state reaction method. Effects of the amount of Co3+on the electrical properties and phase transition are studied. The results indicate that the addition of Co3+enhances the mechanical quality factor Qmsignificantly, whereas the dissipation factor tan δ has a minimum value at x = 3.5. Meanwhile, addition of Co3+leads to small decreases of piezoelectric constant d33, and planar electromechanical coupling kp. The present 0.92(Bi0.5Na0.5)TiO3-0.08BaTiO3+3.5mol% Co3+ceramics exhibit good performance with mechanical quality factor Qm= 910, piezoelectric constant d33= 106pC/N, planar electromechanical coupling kp= 10% and dissipation factor tan δ = 1.1% at 1kHz. Saturated polarization hysteresis loops have been obtained for BNBT-Co ceramics. Two dielectric peaks at depolarization temperature Tdand Tmappear in the curves ofT33vs temperature for the pure BNBT ceramics. However, the first dielectric peak Tddisappears after the addition of Co3+, which means that the transition from ferroelectric to antiferroelectric phase has been eliminated.
Original languageEnglish
Pages (from-to)3257-3259
Number of pages3
JournalChinese Physics Letters
Volume24
Issue number11
DOIs
Publication statusPublished - 1 Nov 2007

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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