Journal of Materials Science

, Volume 43, Issue 2, pp 709–714 | Cite as

A Rosen-type piezoelectric transformer employing lead-free K0.5Na0.5NbO3 ceramics

  • Mingsen Guo
  • K. H. Lam
  • D. M. Lin
  • S. Wang
  • K. W. Kwok
  • Helen L. W. Chan
  • X. Z. Zhao


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 d 33 = 90 pC/N, planar electromechanical coupling factor k p = 0.40, mechanical quality factor Q m = 1900, remanent polarization P r = 11.8 μC/cm2, coercive field E c = 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.


Load Resistance Maximum Output Power Voltage Gain Electromechanical Coupling Factor Mechanical Quality Factor 
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This work was supported by the Niche Area Project (No. 1-BB95) and the Centre for Smart Materials of The Hong Kong Polytechnic University.


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Mingsen Guo
    • 2
    • 1
  • K. H. Lam
    • 2
  • D. M. Lin
    • 2
  • S. Wang
    • 2
    • 1
  • K. W. Kwok
    • 2
  • Helen L. W. Chan
    • 2
  • X. Z. Zhao
    • 1
  1. 1.Department of PhysicsWuhan UniversityWuhanChina
  2. 2.Department of Applied Physics and Materials Research CentreThe Hong Kong Polytechnic UniversityKowloonHong Kong, China

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