Electric field-induced giant strain and piezoelectricity enhancement effect in (Bi_1/2Na_1/2)_0.935+xBa_0.065Ti_1−x(Pr_1/2Nb_1/2)_xO₃ lead-free ceramics

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• 作者：Chunmei Wang^a ; ^b ; Zhijun Xu^a ; ^{zhjxu@sohu.com" class="auth_mail" title="E-mail the corresponding author} ; ^{zhjxu@lcu.edu.cn" class="auth_mail" title="E-mail the corresponding author} ; Renfei Cheng^a ; Ruiqing Chu^a ; Jigong Hao^a ; Wei Li^a ; Huaiyong Li^a ; Juan Du^a ; Guorong Li^c
• 关键词：C. Electrical properties ; Lead-free piezoelectrics ; Electric field-induced strain
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：42
• 期：3
• 页码：4354-4360
• 全文大小：2193 K

文摘

Leadclass="boldFont">-free (Bi_1/2Na_1/2)_0.935+xBa_0.065Ti_1−x(Pr_1/2Nb_1/2)_xO₃ (BNBT–x PN) piezoelectric ceramics were prepared by the conventional solid-state reaction method and the crystal structure and electrical properties were systematically investigated. X-ray diffraction patterns revealed that the (Pr_1/2Nb_1/2)⁴⁺ completely diffused in the BNBT lattice in the studied composition range. An appropriate amount of (Pr_1/2Nb_1/2)⁴⁺ additive enhanced the dielectric, ferroelectric, and piezoelectric properties of BNBT ceramics. The P_r and d₃₃ increased from 29.1 μC/cm² and 121 pC/N of pure BNT to 32.8 μC /cm² and 221 pC/N of modified ceramics with x=0.0050, respectively. Furthermore, electric field-induced strain was enhanced to its maximum value (S_max=0.34%) with normalized strain (class="mathmlsrc">title="View the MathML source" class="mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0272884215022130&_mathId=si0001.gif&_user=111111111&_pii=S0272884215022130&_rdoc=1&_issn=02728842&md5=5e0e7ac103edc85400979bf9ab408145">class="imgLazyJSB inlineImage" height="19" width="21" alt="View the MathML source" title="View the MathML source" src="/sd/grey_pxl.gif" data-inlimgeid="1-s2.0-S0272884215022130-si0001.gif">class="mathContainer hidden">class="mathCode">$d_{33}^{*}$=S_max/E_max=567 pm/V) at an applied electric field of 60 kV/cm for x=0.0075. These findings have great potential for actuator and multifunctional device applications, which may also open up a range of new applications.