The microstructure and ferroelectric properties of (K0.5Na0.5)NbO3–LiNbO3 lead-free piezoelectric ceramics
The microstructure and ferroelectric properties of (K0.5Na0.5)NbO3–LiNbO3 lead-free piezoelectric ceramics
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DOI：
10.1016/j.mseb.2006.09.031
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发表时间：
2007-01
影响因子：
3.6
通讯作者：
Hongliang Du;Fusheng Tang;Daijun Liu;Dongmei Zhu;Wan-cheng Zhou;S. Qu
中科院分区：
文献类型：
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作者：
Hongliang Du;Fusheng Tang;Daijun Liu;Dongmei Zhu;Wan-cheng Zhou;S. Qu
Lead-free piezoelectric ceramics (1-x)(K0. 5Na0. 5) NbO3-xLiNbO3 have been synthesized by traditional ceramics process without cold-isostatic pressing. Effect of the amount of LiNbO3 on the phase structure, microstructure, ferroelectric and piezoelectric properties of (1-x)(K0. 5Na0. 5) NbO3-xLiNbO3 ceramics were investigated. Results show that the pure perovskite phase is in all ceramics specimens (x< 0.08). With the content of LiNbO3 increases, remnant polarization P r, coercive field E c and mechanical quality factor Q m decrease. P r and E c show their minimum in this system when the amount of LiNbO3 is 0.06 mol, respectively. However, 0.94 (K0. 5Na0. 5) NbO3-0.06 LiNbO3 ceramics show the optimum piezoelectric properties. The optimum piezoelectric, dielectric and ferroelectric properties for 0.94 (K0. 5Na0. 5) NbO3-0.06 LiNbO3 ceramics are piezoelectric constant d 33= 215pC/N, planar electromechanical coupling factor kp= 0.41, thickness electromechanical coupling factor kt= 0.48, Q m= 80, P r= 20.0 μC/cm2, E c= 13.4 kV/cm, relative dielectric constant ε r= 530, dielectric loss tan δ= 0.034, Curie temperature T c= 450 deg. C. Compared with other KNN-based piezoelectric ceramics, it can be concluded that 0.94 (K0. 5Na0. 5) NbO3-0.06 LiNbO3 piezoelectric ceramics is a promising candidate for high temperature lead-free piezoelectric ceramics
