Lead-free piezoelectric ceramic (K0.5Na0.5)NbO3with MnO2and K5.4Cu1.3Ta10O29doping for piezoelectric transformer application

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

42 Citations (Scopus)


In this study, K0.5Na0.5NbO3+0.25 mol% MnO2+0.38 mol% K5.4Cu1.3Ta10O29lead-free piezoelectric ceramics were prepared by a conventional ceramic sintering technique and fabricated into a square-plate contour-vibration-mode piezoelectric transformer. The ceramic was well sintered to a dense structure at 1110 °C. Because of the pinning effects provided by the defect dipoles, the ceramic exhibited excellent 'hard' piezoelectric characteristics: d33= 90 pC N-1, kp= 0.40, εr= 300, tanδ = 0.003 and Qm= 1900. The piezoelectric transformer showed a maximum power density of 10 W cm-3with a temperature rise of 20 °C. When operated with a matching load of 8 kΩ, the maximum efficiency of the transformer reached 96%. The transformer has great potential to be used in power supply units and other electronic circuits.
Original languageEnglish
Article number035002
JournalSmart Materials and Structures
Issue number3
Publication statusPublished - 1 Jun 2008

ASJC Scopus subject areas

  • Signal Processing
  • Civil and Structural Engineering
  • Atomic and Molecular Physics, and Optics
  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering


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