Research of Lead-free Na0.5Bi0.5TiO3-BaTiO3 System Piezoelectric Ceramics

Weifeng Zhang; Ming Liu

doi:10.1007/s11595-023-2701-9

Journal of Wuhan University of Technology Materials Science Edition ›› 2023, Vol. 38 ›› Issue (2) : 325 -329. DOI: 10.1007/s11595-023-2701-9

Advanced Materials

Research of Lead-free Na_0.5Bi_0.5TiO₃-BaTiO₃ System Piezoelectric Ceramics

Weifeng Zhang ¹
, Ming Liu ¹^,^{^b}

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Abstract

To reduce the coercive field of Na_0.5Bi_0.5TiO₃, BaTiO₃ were added as dopant materials. Then the (1−x)Na_0.5Bi_0.5TiO₃-xBaTiO₃ ceramic samples were produced in solid synthetic way. The optimum preparation condition and piezoelectric properties of the samples were investigated. The XRD results show that the fabric transites from rhombohedral to tetragonal gradually with the substitution of the Ba²⁺. The morphotropic phase boundaries (MPB) exists in the composition range of 0.06<x<0.10. The scanning electron microscopy (SEM) results show that the growth of the crystalline grain is restrained and the dimension of it turns finer. The study also shows that optimum calcined temperature is 900°C with x<0.06 and 950 °C with x⩾0.06. Suitable sinter temperature is 1 170 °C, and maintained time is 2 hours. Samples in the composition range of MPB exhibit the best piezoelectric performance. The test results show that the remanent polarization and the conceive field of the ceramics decease with the dope of Ba²⁺. In the composition range of MPB, the conceive field exhibits the lowest value.

Keywords

lead-free / piezoelectric ceramic / Na_0.5Bi_0.5TiO₃ / BaTiO₃ / piezoelectric performance

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Weifeng Zhang, Ming Liu. Research of Lead-free Na_0.5Bi_0.5TiO₃-BaTiO₃ System Piezoelectric Ceramics. Journal of Wuhan University of Technology Materials Science Edition, 2023, 38(2): 325-329 DOI:10.1007/s11595-023-2701-9

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