Structure, ferroelectric and piezoelectric properties of (Bi1-x-yNa0.925-x-yLi0.075)0.5BaxSryTiO3lead-free piezoelectric ceramics

Dunmin Lin, Kin Wing Kwok

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8 Citations (Scopus)

Abstract

Lead-free multi-component ceramics (Bi1-x-yNa0.925-x-yLi0.075)0.5BaxSryTiO3have been prepared by an ordinary sintering technique and their structure and electrical properties have been studied. All the ceramics can be well-sintered at 1100 °C. X-ray diffraction patterns shows that Li+, Ba2+and Sr2+diffuse into the Bi0.5Na0.5TiO3lattices to form a new solid solution with a pure perovskite structure, and a morphotropic phase boundary (MPB) is formed at 0.04 < x < 0.08. As compared to pure Bi0.5Na0.5TiO3ceramic, the coercive field ECof the ceramics decreases greatly and the remanent polarization Prof the ceramics increases significantly after the formation of the multi-component solid solution. Due to the MPB, lower ECand higher Pr, the piezoelectricity of the ceramics is greatly improved. For the ceramics with the compositions near the MPB (x = 0.04-0.08 and y = 0.02-0.04), piezoelectric coefficient d33= 133-193 pC/N and planar electromechanical coupling factor kP= 16.2-32.1%. The depolarization temperature Tdreaches a minimum value near the MPB. The temperature dependences of the ferroelectric and dielectric properties suggest that the ceramics may contain both the polar and non-polar regions at temperatures near/above Td.
Original languageEnglish
Pages (from-to)1369-1374
Number of pages6
JournalCurrent Applied Physics
Volume9
Issue number6
DOIs
Publication statusPublished - 1 Nov 2009

Keywords

  • Bi Na TiO 0.5 0.5 3
  • Dielectric
  • Ferroelectric
  • Lead-free
  • Piezoelectric

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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