Piezoelectric and ferroelectric properties of KxNa1-xNbO3lead-free ceramics with MnO2and CuO doping

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

108 Citations (Scopus)


Lead-free ceramics KxNa1-xNbO3doped with MnO2and CuO have been fabricated by an ordinary ceramic technique. The ceramics have an orthorhombic perovskite structure. Our results indicate that the doping of MnO2and CuO is effective in promoting the densification of the ceramics. The MnO2-doped KxNa1-xNbO3ceramics retain the strong ferroelectricity, with the remanent polarization Prand coercive field Ecdecrease slightly with the amount of MnO2. The ceramics also possess a high piezoelectric coefficient (d33= 105-108 pC/N) and relatively large electromechanical coupling factors (kp= 0.43-0.47 and kt= 0.46-0.48). The KxNa1-xNbO3ceramics co-doped with MnO2and CuO exhibit a high mechanical quality factor (Qm∼ 1205) as well as relatively large kpand kt, suggesting that the ceramics are the promising candidates for the transducer and transformer applications.
Original languageEnglish
Pages (from-to)273-278
Number of pages6
JournalJournal of Alloys and Compounds
Issue number1-2
Publication statusPublished - 11 Aug 2008


  • Ceramics
  • Ferroelectrics
  • Piezoelectricity
  • Sintering

ASJC Scopus subject areas

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


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