Microstructure and piezoelectric properties of Li-doped Bi0.5(Na0.825K0.175)0.5TiO3piezoelectric ceramics

✍ Scribed by Chen, Xiaoming ;Liao, Yunwen ;Mao, Lijun ;Deng, Yilan ;Wang, Huaiping ;Chen, Qiang ;Zhu, Jiliang ;Xiao, Dingquan ;Zhu, Jianguo ;Xu, Guangliang

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 384 KB
• Volume: 206
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200925009

✦ Synopsis

Abstract

Piezoelectric ceramics Bi~0.5~(Na~0.825~K~0.175~)~0.5~TiO~3~ + x wt% Li~2~CO~3~ (abbreviated as BNKTL‐x) with x ranging from 0 to 10 were synthesized by conventional solid‐state reaction. XRD results reveal that the ceramics possess pure perovskite phase from x = 0 to x = 1.0. The SEM micrographs show that ceramics have a dense microstructure with a fine grain size at 1145 °C when x < 5.0. The measurements of dielectric and piezoelectric properties indicate that the optimum piezoelectric properties constant d~33~ = 174 pC/N at x = 0.5 and planar electromechanical coupling factor k~p~ = 29.7% at x = 0.75 are observed. The depolarization temperature T~d~ of BNKTL‐1.0 ceramics is above 170 °C. It is apparent that the ceramics can be employed in practical applications. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)