Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/23108
Title: A Rosen-type piezoelectric transformer employing lead-free K 0.5Na0.5NbO3 ceramics
Authors: Guo, M
Lam, KH
Lin, DM
Wang, S
Kwok, KW 
Chan, HLW 
Zhao, XZ
Issue Date: 2008
Publisher: Springer
Source: Journal of materials science, 2008, v. 43, no. 2, p. 709-714 How to cite?
Journal: Journal of materials science 
Abstract: Lead-free K0.5Na0.5NbO3-K 5.4Cu1.3Ta10O29-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.
URI: http://hdl.handle.net/10397/23108
ISSN: 0022-2461
EISSN: 1573-4803
DOI: 10.1007/s10853-007-2199-0
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