Structure and electrical properties of Er₂O₃ doped 0.82Bi_0.5Na_0.5TiO₃-0.18Bi_0.5K_0.5TiO₃ lead-free piezoelectric ceramics

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• 作者：Peng Fu^a ; ^b ; ^{fupeng9806@126.com} ; ^{fupeng@lcu.edu.cn} ; Zhijun Xu^a ; Huimin Zhang^c ; Ruiqing Chu^a ; Wei Li^a ; Meiju Zhao^a
• 关键词：Ceramics ; Microstructure ; Piezoelectricity ; Ferroelectricity ; Dielectric properties
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：September, 2012
• 卷：40
• 期：Complete
• 页码：373-377
• 文件大小：803 K

摘要

Er₂O₃ (0-0.8 wt.%)-doped 0.82Bi_0.5Na_0.5TiO₃-0.18Bi_0.5K_0.5TiO₃ (BNKT18) lead-free piezoelectric ceramics were synthesized by a conventional solid-state reaction method. The effects of Er₂O₃ on the microstructure and electrical properties were investigated. X-ray diffraction (XRD) data shows that Er₂O₃ in an amount of 0.2-0.8 wt.%can diffuse into the lattice of the BNKT18 ceramics and form the pure perovskite phase. Scanning electron microscope (SEM) images indicate that the grain sizes of BNKT18 ceramics decrease with the increase of Er₂O₃ content; in addition, the modified ceramics have the clear grain boundary and a uniformly distributed grain size. At room temperature, the electrical properties of the BNKT18 ceramics have been improved with the addition of Er₂O₃, and the BNKT18 ceramics doped with 0.6 wt.%Er₂O₃ have the highest piezoelectric constant (d₃₃ = 138 pC/N), the highest planar coupling factor (k_p = 0.2382), the highest remnant polarization (P_r = 25.2 渭C/cm²), the higher relative dielectric constant (蔚_r = 936) and lower dissipation factor (tan未 = 0.047) at a frequency of 10 kHz. Moreover, the T_m and T_d of the samples increase with the addition of Er₂O₃.