Microstructures and electrical properties of Bi0.5-(Na1−x−yK xLi y)0.5TiO3 lead-free piezoelectric ceramics

Jing Zhang; Wenzhong Lu; Guifen Fan; Fei Liang

doi:10.1007/s11595-010-0001-7

Journal of Wuhan University of Technology Materials Science Edition ›› 2010, Vol. 25 ›› Issue (3) : 361 -364. DOI: 10.1007/s11595-010-0001-7

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Microstructures and electrical properties of Bi_0.5-(Na_1−x−yK_xLi_y)_0.5TiO₃ lead-free piezoelectric ceramics

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Abstract

The microstructures and electrical properties of Bi_0.5(Na_1−x−yK_xLi_y)_0.5TiO₃ lead-free piezoelectric ceramics were studied. These ceramics were prepared by conventional ceramic technique. XRD analysis reveals that the ceramics possess almost pure perovskite phase when y⩽0.2. The SEM results show that, with more amounts of Li⁺, the crystalline grain growing speed is accelerated, and the sintering temperature can effectively be decreased. The measurements of piezoelectric properties indicate that the ceramics with relatively low amount of Li⁺ and high amount of K⁺ have comparatively large piezoelectricity. The dielectric measurements show that the ceramics have properties like relaxor ferroelectrics and diffuse phase transition (DPT) at T _d and T _c, respectively. The results of ferroelectric measurements reveal the system has relatively higher remanent polarization P _r (27.6 μC/cm²) and lower coercive field E _c (37.5 kV/cm).

Keywords

Bi_0.5Na_0.5TiO₃ / lead-free piezoelectric ceramics / piezoelectric property / remanent polarization

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Jing Zhang, Wenzhong Lu, Guifen Fan, Fei Liang. Microstructures and electrical properties of Bi_0.5-(Na_1−x−yK_xLi_y)_0.5TiO₃ lead-free piezoelectric ceramics. Journal of Wuhan University of Technology Materials Science Edition, 2010, 25(3): 361-364 DOI:10.1007/s11595-010-0001-7

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