Phase structure and electrical properties of K0.5Na0.5(Nb0.94Sb0.06)O3-LiTaO3lead-free piezoelectric ceramics

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)

Abstract

Lead-free piezoelectric ceramics (1-x)K0.5Na0.5(Nb0.94Sb0.06)O3-xLiTaO3have been fabricated by a conventional solid-state sintering technique. The ceramics can be well sintered at 1080-1110 °C and exhibit a dense, single-phase perovskite structure at x ≤ 0.06. Coexistence of the tetragonal and orthorhombic phases is formed in the ceramics with 0.02 < x < 0.05, leading to a significant enhancement in piezoelectric properties. For the ceramic with x = 0.04, the piezoelectric properties become optimum: piezoelectric constant d33= 271 pC N-1, electromechanical coupling coefficients kP= 0.53 and kt= 0.43. Moreover, the ceramics are non-deliquescent and exhibit excellent performance in transducer applications, indicating that the ceramics are ready for replacing lead-containing ceramics in practical applications.
Original languageEnglish
Article number052002
JournalJournal of Physics D: Applied Physics
Volume41
Issue number5
DOIs
Publication statusPublished - 7 Mar 2008

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Acoustics and Ultrasonics
  • Surfaces, Coatings and Films

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