Electromechanical properties of (Ba,Sr)(Zr,Ti)O₃ ceramics

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• 作者：Yao Li^a ; Hongbo Cheng^a ; Huiwen Xu^a ; Yunxiang Zhang^a ; Peng Yan^b ; Ting Huang^c ; Chunming Wang^d ; Zhigao Hu^c ; Jun Ouyang^a ; ^e ; ^{ouyangjun@sdu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Lead-free piezoceramics ; Phase structure ; Polymorphic phase transition ; Piezoelectricity ; Barium titanate
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：42
• 期：8
• 页码：10191-10196
• 全文大小：2012 K

文摘

In this work, we report dielectric, piezoelectric and ferroelectric properties of perovskite Ba_0.95Sr_0.05Zr_xTi_(1−x)O₃ (BSZT, x=0.05, 0.10, 0.15, 0.20) ceramics synthesized by using a solid-state reaction method. It is demonstrated that when the Zr concentration was 5 at% and the sintering temperature was 1400 °C, the BSZT ceramic gives the best overall electromechanical performance, including a large remnant polarization of ~ 12.1 µC/cm², large dielectric constants (${\epsilon }_r^{peak}$≈12,600, ${\epsilon }_r^{RT}$≈3500) and an excellent d₃₃ value of ~355 pC/N. Curie temperature of this ceramic is about ~100 °C. The enhanced electromechanical properties of the BSZT ceramics as compared with Ba_0.95Sr_0.05TiO₃ (BST) can be explained by optimization of the tolerance factor and shift of ferroelectric polymorphic phase transition temperatures (T_PPT).