Piezoelectric properties of Li2O excess (Na0.4875K0.4625Li0.05)(Nb0.95Ta0.5)O3 ceramics by conventional sintering method

Min Soo KIM; Soon Jong JEONG; In Sung KIM; Jae Sung SONG

doi:10.2109/jcersj2.117.592

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Piezoelectric properties of Li₂O excess (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.5)O₃ ceramics by conventional sintering method

Min Soo KIM, Soon Jong JEONG, In Sung KIM, Jae Sung SONG

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Keywords: Piezoelectric, Lead-free, Microstructure, Sintering

JOURNAL FREE ACCESS

2009 Volume 117 Issue 1365 Pages 592-595

DOI https://doi.org/10.2109/jcersj2.117.592

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Abstract

Lead-free piezoelectric ceramics, (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.05)O₃ systems, were developed using the conventional sintering process. The grain growth behavior and piezoelectric properties of the ceramics were investigated. Their sintering temperature was lowered by adding 1 mol% of Li₂O as a sintering aid. When the sample was sintered at 1050°C for 4 h with a composition of 1 mol% of excess Li₂O (Na_0.4875K_0.4625Li_0.05)(Nb_0.95Ta_0.05)O₃, the electro-mechanical coupling factor (k_P) and the piezoelectric coefficient (d₃₃) were found to reach the highest values of 0.42 and 244 pC/N, respectively.

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