TiO2-nonstoichiometry dependence on piezoelectric properties and depolarization temperature of (Bi0.5Na0.5)0.94Ba0.06TiO3lead-free ceramics

X. X. Wang, Siu Wing Or, X. G. Tang, H. L.W. Chan, P. K. Choy, P. C.K. Liu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

45 Citations (Scopus)

Abstract

(Bi0.5Na0.5)0.94Ba0.06TixO1+2xlead-free piezoceramics with x varying from 0.97 to 1.03 were fabricated and characterized in order to investigate the effects of TiO2-nonstoichiometry on the piezoelectric properties and depolarization temperature of (Bi0.5Na0.5)0.94Ba0.06TiO3composition. X-ray diffraction (XRD) analysis showed that all samples have a single phase of perovskite structure with rhombohedral symmetry. Piezoelectric and dielectric measurements revealed that deficiency of TiO2leads to an increase in the piezoelectric coefficient (d33), free relative permittivity (ε33T/ε0), and loss tangent (tan δ) besides an increase in the electromechanical coupling coefficient (kp) within a certain amount, while excess of TiO2results in a decrease in kp, d33, and ε33T/ε0, but an increase in tan δ. Depolarization temperature (Td) measurement indicated a decrease and an increase in Tdas a result of increasing TiO2deficiency and TiO2excess, respectively. This TiO2-nonstoichiometry also induced changes in the remanent polarization (Pr) and coercive field (Ec) of the ceramics.
Original languageEnglish
Pages (from-to)659-663
Number of pages5
JournalSolid State Communications
Volume134
Issue number10
DOIs
Publication statusPublished - 1 Jun 2005

Keywords

  • A. Ferroelectrics
  • D. Dielectric response
  • D. Phase transition
  • D. Piezoelectricity

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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