Lin, D., Guo, M.S., Lam, K.H. , Kwok, K.W. and Chan, H.L.W. (2008) Lead-free piezoelectric ceramic (K0.5Na0.5) NbO3 with MnO2 and K5.4Cu1.3Ta10O29 doping for piezoelectric transformer application. Smart Materials and Structures, 17(3), 035002. (doi: 10.1088/0964-1726/17/3/035002)
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Abstract
In this study, K0.5Na0.5NbO3+0.25 mol% MnO2+0.38 mol% K5.4Cu1.3Ta10O29 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Lam, Dr Koko |
| Authors: | Lin, D., Guo, M.S., Lam, K.H., Kwok, K.W., and Chan, H.L.W. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Smart Materials and Structures |
| Publisher: | IOP Publishing |
| ISSN: | 0964-1726 |
| ISSN (Online): | 1361-665X |
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