Structure and electrical properties of (1 ? x) (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃-x BiAlO₃ lead-free piezoelectric ceramics

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• 作者：Peng Fu^a ; ^b ; ^{fupeng9806@126.com} ; ^{fupeng@lcu.edu.cn} ; Zhijun Xu^a ; Ruiqing Chu^a ; Xueyan Wu^b ; ^{xueyan_wu2003@hotmail.com} ; Wei Li^a ; Xiaodong Li^c
• 关键词：Ceramics ; Microstructure ; Piezoelectricity ; Ferroelectricity ; Dielectric properties
• 刊名：Materials and Design
• 出版年：2013
• 出版时间：April, 2013
• 年：2013
• 卷：46
• 期：Complete
• 页码：322-327
• 全文大小：998 K

文摘

(1 ? x) (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃-x BiAlO₃ ((1 ? x) BNBT6-x BA) lead-free piezoelectric ceramics were synthesized by conventional solid-state processes. Effects of BiAlO₃ (BA) on the structure and electrical properties of (Na_0.5Bi_0.5)_0.94Ba_0.06TiO₃ (BNBT6) ceramics were investigated. X-ray diffraction (XRD) data shows that (1 ? x) BNBT6-x BA ceramics form the pure perovskite phases, and the ceramics have the morphotropic phase boundary (MPB) when x < 0.0500. At room temperature, the electrical properties of the BNBT6 ceramics have been improved with the addition of appropriate BA. At room temperature, (1 ? x) BNBT6-x BA ceramics at x = 0.0225 have the highest remnant polarization (P_r = 42.5 ¦ÌC/cm²), the highest piezoelectric coefficient (d₃₃ = 204 pC/N), the highest planar coupling factor (k_p = 0.3292), the highest dielectric constant (?_r = 1687) and higher mechanical quality factor (Q_m = 112).