Ferroelectric and piezoelectric properties of Bi0.5Na0.5TiO3-SrTiO3-Bi0.5Li0.5TiO3lead-free ceramics

Dunmin Lin, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review

52 Citations (Scopus)

Abstract

New lead-free ternary ceramics (1 - x - y)Bi0.5Na0.5TiO3-xSrTiO3-yBi0.5Li0.5TiO3have been prepared by an ordinary sintering technique and their ferroelectric and piezoelectric properties have been studied. All the ceramics can be well-sintered at 1100 °C. The results of X-ray diffraction reveal that Li+and Sr2+diffuse into the Bi0.5Na0.5TiO3lattices to form a new solid solution with a single-phase rhombohedral perovskite structure. After the substitutions of Li+and Sr2+, the coercive field ECdecreases, the remanent polarization Princreases, and hence the piezoelectric coefficient d33and planar electromechanical coupling factor kpincrease. For the ceramics with x = 0.13-0.15 and y = 0.10- 0.15, the piezoelectric properties become optimum, giving d33= 127-146 pC/N and kP= 0.24-0.30. Our results also suggest that the ceramics may contain both the polar and non-polar regions near the depolarization temperature Td, which cause the polarization hysteresis loop become deformed and the ceramics become depolarized.
Original languageEnglish
Pages (from-to)310-315
Number of pages6
JournalJournal of Alloys and Compounds
Volume481
Issue number1-2
DOIs
Publication statusPublished - 29 Jul 2009

Keywords

  • Ceramics
  • Ferroelectrics
  • Piezoelectricity
  • Sintering

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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