Microstructures and Electrical Properties of Bi_(0.5)-(Na_(1-x-y)K_xLi_y)_(0.5)TiO_3 Lead-free Piezoelectric Ceramics |
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Authors: | Jing Zhang Wenzhong Lu Guifen Fan Fei Liang |
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Affiliation: | (1) Department of Materials Science, Sichuan University, Chengdu, 610064, People’s Republic of China |
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Abstract: | The microstructures and electrical properties of Bi0.5(Na1−x−y K x Li 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). |
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Keywords: | Bi0.5Na0.5TiO3 lead-free piezoelectric ceramics piezoelectric property remanent polarization |
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