A Rosen-type piezoelectric transformer employing lead-free K0.5Na0.5NbO3ceramics

Mingsen Guo, Kwok Ho Lam, D. M. Lin, S. Wang, Kin Wing Kwok, Helen L.W. Chan, X. Z. Zhao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)


Lead-free K0.5Na0.5NbO3-K5.4Cu1.3Ta10O29-MnO2(KNN-KCT-Mn) ceramics have been prepared by a conventional ceramic sintering technique. The ceramics show excellent piezoelectric properties for application in power devices, and the optimum properties measured are as follows: piezoelectric constant d33= 90 pC/N, planar electromechanical coupling factor kp= 0.40, mechanical quality factor Qm= 1900, remanent polarization Pr= 11.8 μC/cm2, coercive field Ec= 0.85 kV/mm. A Rosen-type piezoelectric transformer with a dimension of 21 mm × 6 mm × 1.2 mm was fabricated using the KNN-KCT-Mn ceramics. Properties of the piezoelectric transformer operating in the first and second modes have been characterized. For the first mode, the transformer has a maximum output power of 0.7 W with a temperature rise of 14 °C. For the second mode, the maximum output power of the transformer is 1.8 W with a temperature rise of 33 °C. KNN-KCT-Mn ceramics have shown to be a potential lead-free candidate to be used in high-voltage-low-current devices.
Original languageEnglish
Pages (from-to)709-714
Number of pages6
JournalJournal of Materials Science
Issue number2
Publication statusPublished - 1 Jan 2008

ASJC Scopus subject areas

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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