Fabrication and characterization of low temperature sintering PMN–PZN–PZT step-down multilayer piezoelectric transformer
✍ Scribed by Xiaolian Chao; Zupei Yang; Gang Li; Yaoqiang Cheng
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 420 KB
- Volume
- 144
- Category
- Article
- ISSN
- 0924-4247
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✦ Synopsis
For the fabrication as step-down multilayer piezoelectric transformer, piezoelectric properties of Pb(Mg 1/3 Nb 2/3 )O 3 -Pb(Zn 1/3 Nb 2/3 )O 3 -Pb(Zr 0.52 Ti 0.48 )O 3 (PMN-PZN-PZT) ceramics were optimized by ZnO-Li 2 CO 3 (ZL) and Pb 3 O 4 content. Effects of the additions on the structure, bulk density and electrical properties of ceramics were investigated. The results revealed that the proper additions of ZL with Pb 3 O 4 content could modify the electrical properties of the PMN-PZN-PZT ceramics. The composition sintered at 995 • C with 0. 01 wt.% ZL and 0.10 wt.% Pb 3 O 4 content showed higher values, which were listed as follows: d 33 = 256 pC/N, K p = 0.60, Q m = 1910, ε r = 1032, tan δ = 0.0070 and r = 2.09 . In addition, the step-down piezoelectric transformers with optimized PMN-PZN-PZT composites were fabricated and the characteristics as the output power and resistance loads were measured. Meanwhile, the step-down piezoelectric transformers sintered at 995 • C showed the favorable characteristics with a higher gain G of 0.204 and a lower temperature rise of 6 • C when the output power was 5 W, and the driving frequency were approximately constant (≈126 kHz) when the output power was from 5 to 13 W. Moreover, the maximum efficiency (90.2%) was obtained at load resistance of 10 .