Synthesis and piezoelectric properties of lead-free (Bi0.5Na0.5)1−x(BaaSrb) xTiO3 ceramics

Yan Hongjian; Xiao Dingquan; Zhu Jianguo; Yu Ping; Li Linzhi; Lin Dunming; Li Guiying; Zhang Wen

doi:10.1007/BF02841294

Journal of Wuhan University of Technology Materials Science Edition ›› 2005, Vol. 20 ›› Issue (4) : 97 -99. DOI: 10.1007/BF02841294

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Synthesis and piezoelectric properties of lead-free (Bi_0.5Na_0.5)_1−x(Ba_aSr_b)_xTiO₃ ceramics

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Abstract

A new group of lead-free piezoelectric ceramics, (Bi_0.5Na_0.5)_1−x(BaaSrb)_xTiO₃ (abbreviated as BNBST[100x−100a/100b], 0<x<1, a+b=1), was synthesized. The ceramics were prepared by conventional ceramic sintering technique, and the ceramics with density of 95% of the theoretical one can be sintered without the atmosphere control during the sintering process. The results of the X-ray diffraction (XRD) data show that the ceramics possess a single perovskite phase. The measurements of dielectric and piezoelectric properties reveal that the ceramics provide relatively high piezoelectric charge constant d₃₃ and high planar electromechanical coupling factor k_p. For the BNBST6-95/5 ceramics, d₃₃ is equal to 170pC/N, and k_p is equal to 32.0%. The fabrication technique for these ceramics is conventional and stable.

Keywords

piezoelectric ceramics / lead-free / bismuth sodium titanate / Bi_0.5Na_0.5TiO₃-based / planar electromechanical coupling factor / piezoelectric charge constant

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Yan Hongjian, Xiao Dingquan, Zhu Jianguo, Yu Ping, Li Linzhi, Lin Dunming, Li Guiying, Zhang Wen. Synthesis and piezoelectric properties of lead-free (Bi_0.5Na_0.5)_1−x(Ba_aSr_b)_xTiO₃ ceramics. Journal of Wuhan University of Technology Materials Science Edition, 2005, 20(4): 97-99 DOI:10.1007/BF02841294

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