Giant piezoelectricity in potassium-sodium niobate lead-free ceramics.


Environment protection and human health concern is the driving force to eliminate the lead from commercial piezoelectric materials. In 2004, Saito et al. [ Saito et al., Nature , 2004 , 432 , 84 . ] developed an alkali niobate-based perovskite solid solution with a peak piezoelectric constant d33 of 416 pC/N when prepared in the textured polycrystalline form, intriguing the enthusiasm of developing high-performance lead-free piezoceramics. Although much attention has been paid on the alkali niobate-based system in the past ten years, no significant breakthrough in its d33 has yet been attained. Here, we report an alkali niobate-based lead-free piezoceramic with the largest d33 of ∼490 pC/N ever reported so far using conventional solid-state method. In addition, this material system also exhibits excellent integrated performance with d33∼390-490 pC/N and TC∼217-304 °C by optimizing the compositions. This giant d33 of the alkali niobate-based lead-free piezoceramics is ascribed to not only the construction of a new rhombohedral-tetragonal phase boundary but also enhanced dielectric and ferroelectric properties. Our finding may pave the way for "lead-free at last".

DOI: 10.1021/ja500076h

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@article{Wang2014GiantPI, title={Giant piezoelectricity in potassium-sodium niobate lead-free ceramics.}, author={Xiaopeng Wang and Jiagang Wu and Dingquan Xiao and Jianguo Zhu and Xiaojing Cheng and Ting Zheng and Binyu Zhang and Xiaojie Lou and Xiangjian Wang}, journal={Journal of the American Chemical Society}, year={2014}, volume={136 7}, pages={2905-10} }