Ferroelectric and piezoelectric properties of new NaNbO3-Bi0.5K0.5TiO3lead-free ceramics

Dunmin Lin, Kin Wing Kwok

Research output: Journal article publicationJournal articleAcademic researchpeer-review

18 Citations (Scopus)


New lead-free ceramics (1-x)NaNbO3-xBi0.5K0.5TiO3have been fabricated by the conventional ceramic sintering technique, and their ferroelectric and piezoelectric properties have been studied. The results of X-ray diffraction reveal that Bi0.5K0.5TiO3diffuses into the NaNbO3lattices to form a new perovskite-type solid solution with orthorhombic symmetry. The addition of a small amount of Bi0.5K0.5TiO3(x ≥ 0.025) transforms the ceramics from antiferroelectric to ferroelectric. The ceramic with x = 0.10 possesses the largest remanent polarization Prand thus exhibits the optimum piezoelectric properties, giving d33= 71 pC/N, kp= 16.6% and kt= 39.7%. The ceramics with low doping level of Bi0.5K0.5TiO3are normal ferroelectrics and the ferroelectric-paraelectric phase transition becomes diffusive gradually with the doping level x of Bi0.5K0.5TiO3increasing. Our results show the (1-x)NaNbO3-xBi0.5K0.5TiO3ceramics is one of the good candidates for lead-free piezoelectric and ferroelectric materials.
Original languageEnglish
Pages (from-to)1060-1065
Number of pages6
JournalJournal of Materials Science: Materials in Electronics
Issue number10
Publication statusPublished - 1 Oct 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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