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

Autor: Guifen Fan, Jing Zhang, Wen-Zhong Lu, Fei Liang
Rok vydání: 2010
Předmět:
Zdroj: Journal of Wuhan University of Technology-Mater. Sci. Ed.. 25:361-364
ISSN: 1993-0437
1000-2413
DOI: 10.1007/s11595-010-0001-7
Popis: 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).
Databáze: OpenAIRE
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