Giant Piezoelectricity in Potassium–Sodium Niobate Lead-Free Ceramics

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• 作者：Xiaopeng Wang ; Jiagang Wu ; Dingquan Xiao ; Jianguo Zhu ; Xiaojing Cheng ; Ting Zheng ; Binyu Zhang ; Xiaojie Lou ; Xiangjian Wang
• 刊名：Journal of the American Chemical Society
• 出版年：2014
• 出版时间：February 19, 2014
• 年：2014
• 卷：136
• 期：7
• 页码：2905-2910
• 全文大小：603K
• ISSN：1520-5126

文摘

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,pan class="NLM_x"> pan>2004pan class="NLM_x">, pan>432pan class="NLM_x">, pan>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 d₃₃390鈥?90 pC/N and T_C217鈥?04 掳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鈥搕etragonal phase boundary but also enhanced dielectric and ferroelectric properties. Our finding may pave the way for 鈥渓ead-free at last鈥?