Fabrication of Lead-Free Lithium-Doped Na 0.5 K 0.5 NbO 3 Piezoelectric Ceramics with Dense Grain Structure Using Sol–Gel Surface Coating
Lead-free piezoelectric 0.06(LiNbO 3 )–0.94(Na 0.5 K 0.5 )NbO 3 (LNKN) ceramics in disc form were fabricated and characterized to acquire good electromechanical properties. A molding method including cold isostatic pressing (CIP) was used to form a dense and regular microstructure and suppress the c...
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Published in | Japanese Journal of Applied Physics Vol. 52; no. 10S; p. 10 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.10.2013
|
Online Access | Get full text |
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Summary: | Lead-free piezoelectric 0.06(LiNbO
3
)–0.94(Na
0.5
K
0.5
)NbO
3
(LNKN) ceramics in disc form were fabricated and characterized to acquire good electromechanical properties. A molding method including cold isostatic pressing (CIP) was used to form a dense and regular microstructure and suppress the cracking problems of LNKN ceramics during the following high-temperature sintering. The LNKN ceramic sintered at 1040 °C showed a high piezoelectric constant
d
33
of 170 pC/N owing to its high density. Furthermore, perovskite LNKN films with the same composition as the ceramics were fabricated using 2-methoxyethanol-based sol–gel solution. The sol–gel surface coating on the LNKN ceramics was found to be very effective for increasing the piezoelectric constant because of the interface stabilization effect leading to a uniform electric field in piezoelectric elements. As a result, we obtained the highest piezoelectric constant
d
33
of 183 pC/N. The lead-free LNKN ceramics are promising for applications in eco-friendly ferroelectric and piezoelectric devices. |
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ISSN: | 0021-4922 1347-4065 |
DOI: | 10.7567/JJAP.52.10MB15 |