High power density NaNbO3-LiTaO3 lead-free piezoelectric transformer in radial vibration modes

H. L. Sun, D. M. Lin, Kwok Ho Lam, M. S. Guo, S. H. Choy, Kin Wing Kwok, H. L.W. Chan

Research output: Journal article publicationJournal articleAcademic researchpeer-review


In the present work, the sintering temperature was able to substantially influence the microstructure and electrical properties of the lead-free ceramic 0.88NaNbO3-0.12LiTaO3. This composition without any acceptor doping presents a high mechanical quality factor, Qm, value of 1469 and a high Curie temperature of 305 °C by optimizing the sintering temperature at 1330 °C. We applied this material to make a device of disk-shaped piezoelectric transformers with a ring-dot structure and further focused on investigating the characteristics of the piezoelectric transformers. With matching load, a maximum efficiency of 92% occurs in the fundamental mode, and the maximum voltage gains are 5.5 and 3.7 for the fundamental and third radial vibration modes, respectively. The experimental results show a maximum output power of 10.5 W with a temperature rise of 27 °C. It is noteworthy that a high output power density (as high as 32.8 W cm-3) was obtained under a maximum input voltage of 180 V, which is comparable to the performance of PZT in a piezoelectric ceramic transformer device.
Original languageEnglish
Article number065017
JournalSmart Materials and Structures
Issue number6
Publication statusPublished - 1 Jun 2015


  • ceramic
  • disk-shaped
  • high power density
  • lead-free
  • NN-based
  • transformer

ASJC Scopus subject areas

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


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