A Rosen-type piezoelectric transformer employing lead-free K(0.5)Na(0.5)NbO(3) ceramics

Guo, M., Lam, K.H. , Lin, D.M., Wang, S., Kwok, K.W., Chan, H. L.W. and Zhao, X.Z. (2008) A Rosen-type piezoelectric transformer employing lead-free K(0.5)Na(0.5)NbO(3) ceramics. Journal of Materials Science, 43, pp. 709-714. (doi: 10.1007/s10853-007-2199-0)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Lam, Dr Koko
• Authors: Guo, M., Lam, K.H., Lin, D.M., Wang, S., Kwok, K.W., Chan, H. L.W., and Zhao, X.Z.
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Journal of Materials Science
• Publisher: Springer
• ISSN: 0022-2461
• ISSN (Online): 1573-4803