Thermally stable piezoelectric properties of (K, Na)NbO₃-based lead-free perovskite with rhombohedral-tetragonal coexisting phase

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• 作者：Mao-Hua Zhang^a ; Ke Wang^a ; ; Jin-Song Zhou^a ; Jia-Jun Zhou^b ; Xiangcheng Chu^a ; Xiang Lv^c ; Jiagang Wu^c ; Jing-Feng Li^a
• 关键词：Piezoelectric ; Lead free ; Niobate ; Perovskite ; Thermally stable
• 刊名：Acta Materialia
• 出版年：2017
• 出版时间：1 January 2017
• 年：2017
• 卷：122
• 期：Complete
• 页码：344-351
• 全文大小：2438 K

文摘

A feasible replacement for lead-based piezoelectric ceramics is desperately required for increasing environmental concerns. Benefiting from the construction of a rhombohedral-tetragonal (R-T) phase boundary, a potential lead-free candidate (Na_0.5K_0.5)NbO₃-(Bi_0.5Li_0.5)TiO₃-BaZrO₃ is presented in this study, with a large piezoelectric coefficient d₃₃ of 330 pC/N and a unipolar strain of 0.16% at 4 kV/mm. More importantly, the piezoresponse is extremely thermally stable that the strain can maintain a considerable value of 0.12% at the temperature as high as 190 °C, rendering the current system very promising for piezoelectric actuator applications. The temperature dependent phase structure evolution as well as piezoelectric response is investigated systematically for interpretation of underlying mechanisms.