کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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739502 | 1461900 | 2013 | 7 صفحه PDF | دانلود رایگان |
We investigated the effect of inner electrode composition on the microstructure and electromechanical properties of Bi0.5(Na0.82K0.18)0.5TiO3 (BNKT) multilayer ceramic actuators. Using tape-casting and screen printing techniques, multilayered laminates were prepared by stacking green sheets of Nb-modified BNKT ceramic layers with AgPd (70/30 in weight ratio) thick films as the inner electrode. After co-firing at temperatures of 1100–1140 °C for 4 h in air, the multilayered structure revealed significant camber as well as cracks due to the mismatch in thermal shrinkage between the ceramic and the AgPd layer. However, the addition of 10 wt% (K0.47Na0.51Li0.02)(Nb0.8Ta0.2)O3 (KNLNT) powder into the inner electrode markedly suppressed the generation of co-firing-induced defects. More surprisingly, the normalized electric-field induced strain (Smax/Emax) of BNKT multilayer actuators was enhanced from 110 pm/V to 350 pm/V by adding ceramic KNLNT into the AgPd inner electrode.
Journal: Sensors and Actuators A: Physical - Volume 200, 1 October 2013, Pages 107–113