Preparation and Characterization of (K0.5Na0.5)0.94-2xLi0.06SrxNb0.98Sb0.02O3 Lead-free Piezoelectric Ceramics

doi:10.3724/SP.J.1077.2010.01164

Abstract

Abstract: Lead-free (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ (KNLSN-Sr_x; x=0-0.03) piezoelectric ceramics were prepared by conventional solid-state sintering process. The sintering characteristic, the microstructure, dielectric, piezoelectric and ferroelectric properties of KNLSN-Sr_x ceramics were investigated. XRD results show that all samples exhibite a pure perovskite phase with tetragonal symmetry, indicating that the Sr²⁺ has diffused into the KNLSN lattices to form a solid solution. The grain size of KNLSN-Sr_x ceramics was increased with the increasing of Sr-doping level. The proper sintering temperature of KNLSN-Sr_x ceramics shifted to higher temperature with increasing the content of Sb. Higher d₃₃ and kp, lower tanδ and Qm were obtained as Li, Sr and Sb were added into KNN ceramics. The comprehensive good properties of doped (K_0.5Na_0.5)NbO₃ ceramics were obtained when Sr content was 2mol% (d₃₃=130pC/N, k_p=34.5%, tanδ=4.2%).

Key words: lead free piezoelectric, sodium potassium niobate, dielectric constant, piezoelectric constant

CLC Number:

TN379

CHU Rui-Qing, HAO Ji-Gong, XU Zhi-Jun, ZANG Guo-Zhong. Preparation and Characterization of (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ Lead-free Piezoelectric Ceramics[J]. Journal of Inorganic Materials, 2010, 25(11): 1164-1168.

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Preparation and Characterization of (K_0.5Na_0.5)_0.94-2xLi_0.06Sr_xNb_0.98Sb_0.02O₃ Lead-free Piezoelectric Ceramics

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