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Piezoelectric and dielectric properties of Bi0.5Na0.5TiO3–Bi0.5Li0.5TiO3 lead-free ceramics

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Abstract

(1 − x)Bi0.5Na0.5TiO3–xBi0.5Li0.5TiO3 lead-free ceramics have been prepared by a conventional solid-state reaction method, and their piezoelectric and dielectric properties have been studied. X-ray diffraction studies reveal that Li+ diffuses into the Bi0.5Na0.5TiO3 lattices to form a solid solution with a pure perovskite structure. The addition of Bi0.5Li0.5TiO3 effectively lowers the sintering temperature of the ceramics and greatly assists in the densification of the ceramics. The ceramic with x = 0.075 possesses the optimum piezoelectric properties: piezoelectric coefficient d 33 = 121 pC/N and planar electromechanical coupling factor k P = 18.3%. After the partial substitution of Li+ for Na+ in the A-sites of Bi0.5Na0.5TiO3, the ceramics exhibit more relaxor characteristic, which is probably resulted from the cation disordering in the 12-fold coordination sites. The depolarization temperature T d shifts to low temperature with the substitution level x of Li+ for Na+ increasing.

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Acknowledgment

This work was supported by the project of NSFC (50572066).

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Authors and Affiliations

  1. College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China

    Dunmin Lin, Chenggang Xu, Qiaoji Zheng & Daojiang Gao

  2. Department of Dyeing & Finishing and Environment, Chengdu Textile College, Chengdu, 611731, China

    Yujun Wei

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  1. Dunmin Lin
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  2. Chenggang Xu
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Correspondence to Dunmin Lin.

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Lin, D., Xu, C., Zheng, Q. et al. Piezoelectric and dielectric properties of Bi0.5Na0.5TiO3–Bi0.5Li0.5TiO3 lead-free ceramics. J Mater Sci: Mater Electron 20, 393–397 (2009). https://doi.org/10.1007/s10854-008-9741-y

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