Preparation and Characterization of Lead-Free Piezoelectric Ceramics

Abstract:

(K,Na)NbO₃-based piezoelectric ceramics are promising candidates for practical applications of lead-free piezoelectric materials due to their excellent piezoelectric properties. In this paper, lead-free piezoelectric ceramics (K_0.44Na_0.52Li_0.04)(Nb_0.86Ta_0.10Sb_0.04)O₃ (KNL-NTS) were successfully fabricated by traditional ceramics processing. The effects of sintering temperature on the structure, density and electrical properties of KNL-NTS ceramics were investigated. Crystal phases of both calcined powders and KNL-NTS ceramics have orthorhombic structure similar to that of KNbO3 ceramics. The piezoelectric coefficient first increases and then decreases with sintering temperature in the 1100-1180 °C range. KNL-NTS ceramics sintered at 1160 °C shows the maximum piezoelectric coefficient of about 199 pC·N^-1 and the maximum remnant polarization of 18.75 μC·cm^-2, with the corresponding 10.95 kV·cm^-1 coercive field and 4.74 g/cm³ density.

• Periodical: Key Engineering Materials (Volume 492)
• Pages: 189-193
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.492.189
• Online since: September 2011
• Authors: Qiang Chen, Jin Xu Li, Li Hui Zhang, Yang Bai, Yan Jing Su, Li Jie Qiao, Alex A. Volinsky
• Keywords: (K,Na)NbO₃, Perovskite, Piezoelectric Properties, Sintering

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