, Volume 16, Issue 2, pp 152-155
Date: 11 Mar 2010

Molten salt synthesis of (K0.47Na0.47Li0.06)NbO3 lead-free piezoelectric ceramics

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Abstract

(K0.47Na0.47Li0.06)NbO3 (KNLN) lead-free ceramics were prepared by molten salt synthesis (MSS) method using k2CO3-Na2CO3 eutectic mixtures as the flux. The microstructure and piezoelectric properties when sintered at 980–1 030 °C were investigated. The calcined powders were examined by X-ray diffraction. The microstructure of the calcined powders and sintered bodies was observed using a scanning electron microscope (SEM).The piezoelectric constant d 33 was measured using a quasi-static piezoelectric d 33 meter. The planar coupling coefficient K p was calculated by resonance-antiresonance method. The experimental data for each sample’s performance indicators were the average values of 8 specimens. The relative densities of sintered specimens are above 97%, and the dielectric loss is below 0.03. It was found that (K0.47Na0.47Li0.06)NbO3 prepared by MSS is compact and lead-free. The piezoelectric constant d 33 is 216 pC·N−1 and the planar electromechanical coupling factor K p is 0.352.

Supported by National Natural Science Foundation of China (No.10232030) and Key Laboratory for Advanced Ceramics and Machining Technology, Ministry of Education, Tianjin University (No. x06050).
LI Jianhua, born in 1979, male, Dr. Correspondence to SUN Qingchi