Gd₂O₃ 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 ; Ruiqing Chu^a ; Wei Li^a ; Wei Wang^a ; Yong Liu^a
• 关键词：Composites ; Microstructure ; Electrical
• 刊名：Materials and Design
• 出版年：2012
• 期刊代码：56_02613069
• 类别：ms
• 出版时间：March, 2012
• 卷：35
• 期：Complete
• 页码：276-280
• 文件大小：697 K

摘要

Gd₂O₃ (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 process. The effects of Gd₂O₃ on the microstructure, the dielectric, ferroelectric and piezoelectric properties were investigated. X-ray diffraction (XRD) data shows that Gd₂O₃ in an amount of 0.2-0.8 wt.%can diffuse into the lattice of BNKT18 ceramics and form a pure perovskite phase. Scanning electron microscope (SEM) images indicate that the grain size of BNKT18 ceramics decreases with the increase of Gd₂O₃ content; in addition, all the modified ceramics have a clear grain boundary and a uniformly distributed grain size. At room temperature, the ferroelectric and piezoelectric properties of the BNKT18 ceramics have been improved with the addition of Gd₂O₃, and the BNKT18 ceramics doped with 0.4 wt.%Gd₂O₃ have the highest piezoelectric constant (d₃₃ = 137 pC/N), highest relative dielectric constant (蔚_r = 1023) and lower dissipation factor (tan 未 = 0.044) at a frequency of 10 kHz. The BNKT18 ceramics doped with 0.2 wt.%Gd₂O₃ have the highest planar coupling factor (k_p = 0.2463).