Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/28238
Title: Lead-free piezoelectric ceramic (K0.5Na0.5)NbO 3 with MnO2 and K5.4Cu1.3Ta 10O29 doping for piezoelectric transformer application
Authors: Lin, D
Guo, MS
Lam, KH
kwok, KW 
Chan, HLW 
Issue Date: 2008
Publisher: Institute of Physics Publishing
Source: Smart materials and structures, 2008, v. 17, no. 3, 035002 How to cite?
Journal: Smart materials and structures 
Abstract: In this study, K0.5Na0.5NbO3+0.25 mol% MnO2+0.38 mol% K5.4Cu1.3Ta10O 29 lead-free piezoelectric ceramics were prepared by a conventional ceramic sintering technique and fabricated into a square-plate contour-vibration-mode piezoelectric transformer. The ceramic was well sintered to a dense structure at 1110 °C. Because of the pinning effects provided by the defect dipoles, the ceramic exhibited excellent 'hard' piezoelectric characteristics: d33 = 90 pC N-1, kp = 0.40, εr = 300, tanδ = 0.003 and Qm = 1900. The piezoelectric transformer showed a maximum power density of 10 W cm-3 with a temperature rise of 20 °C. When operated with a matching load of 8 kΩ, the maximum efficiency of the transformer reached 96%. The transformer has great potential to be used in power supply units and other electronic circuits.
URI: http://hdl.handle.net/10397/28238
ISSN: 0964-1726
EISSN: 1361-665X
DOI: 10.1088/0964-1726/17/3/035002
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