Giant piezoelectric effect and high strain response in (1∿span style='font-style: italic'>x)(K_0.45Na_0.55)(Nb_1−ySb_y)O₃ -xBi_0.5Na_0.5Zr_{1∿span style='font-style: italic'>z}

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• 作者：Hong Tao ; Jiagang Wu ; ^{wujiagang0208@163.com" class="auth_mail" title="E-mail the corresponding author} ; ^{msewujg@scu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Potassium&ndash ; sodium niobate ; Multiphase coexistence ; Large piezoelectricity ; High strain ; Physical mechanism
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：36
• 期：7
• 页码：1605-1612
• 全文大小：3853 K

文摘

Here, we reported a high electric field-induced strain value of 0.34% (S_max/E_max = 901 pmV⁻¹) under a low electric field of 3.7 kV/mm as well as a large d₃₃ (∼418 pC/N) in the (1−x)(K_0.45Na_0.55)(Nb_1−ySb_y)O₃ -xBi_0.5Na_0.5Zr_1−zHf_zO₃ ceramics with x = 0.035, y = 0.04, and z = 0.75, which is mainly ascribed to the involvement of R-T phase boundary as well as optimized compositions (Hf/Zr). We investigated the relationships among composition, phase boundary, and electrical properties through (1−x)(K_0.45Na_0.55)(Nb_1−ySb_y)O₃ -xBi_0.5Na_0.5Zr_1−zHf_zO₃ ceramics. The R-T phase boundary is constructed in the ceramics with 0.035 ≤ x ≤ 0.05, 0.04 ≤ y ≤ 0.08, and 0 ≤ z ≤ 1.0. Meanwhile, the highest piezoelectric coefficient of d₃₃ ∼ 442 pC/N were obtained for x = 0.0375, y = 0.04, and z = 0.15 due to the coexistence of R and T phases. Both dielectric constant and remanent polarization can gain the most excellent values for R-T, which is responsible for the enhanced piezoelectricity. We believe that such an investigation can promote the electrical properties of (K, Na)NbO₃-based ceramics and then provide practical applications.