Microstructure and piezoelectric properties of 0.95(Na0.5K 0.5)NbO3-0.05SrTiO3 ceramics

Kyung Hoon Cho; Hwi Yeol Park; Cheol Woo Ahn; Sahn Nahm; Kenji Uchino; Seung Ho Park; Hyeung Gyu Lee; Hwack Joo Lee

doi:10.1111/j.1551-2916.2007.01715.x

Microstructure and piezoelectric properties of 0.95(Na_0.5K _0.5)NbO₃-0.05SrTiO₃ ceramics

Kyung Hoon Cho, Hwi Yeol Park, Cheol Woo Ahn, Sahn Nahm, Kenji Uchino, Seung Ho Park, Hyeung Gyu Lee, Hwack Joo Lee

Department of Materials Science and Engineering

Research output: Contribution to journal › Article

60 Citations (Scopus)

Abstract

The 0.95(Na0.5K0.5)NbO3-0.05SrTiO3 (0.95NKN-0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na2O was intentionally subtracted from the 0.95NKN-0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na2O-subtracted 0.95NKN-0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na0.49K0.5)NbO2.995-0.05ST ceramics showed high piezoelectric properties of d33=220, kp=0.4, Qm=72, and ε3T/εo=1447, thereby demonstrating their promising potential as a candidate material for application to lead-free piezoelectric ceramics.

Original language	English
Pages (from-to)	1946-1949
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	90
Issue number	6
DOIs	https://doi.org/10.1111/j.1551-2916.2007.01715.x
Publication status	Published - 2007 Jun

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

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Cho, K. H., Park, H. Y., Ahn, C. W., Nahm, S., Uchino, K., Park, S. H., Lee, H. G., & Lee, H. J. (2007). Microstructure and piezoelectric properties of 0.95(Na_0.5K _0.5)NbO₃-0.05SrTiO₃ ceramics. Journal of the American Ceramic Society, 90(6), 1946-1949. https://doi.org/10.1111/j.1551-2916.2007.01715.x

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abstract = "The 0.95(Na0.5K0.5)NbO3-0.05SrTiO3 (0.95NKN-0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na2O was intentionally subtracted from the 0.95NKN-0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na2O-subtracted 0.95NKN-0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na0.49K0.5)NbO2.995-0.05ST ceramics showed high piezoelectric properties of d33=220, kp=0.4, Qm=72, and ε3T/εo=1447, thereby demonstrating their promising potential as a candidate material for application to lead-free piezoelectric ceramics.",

author = "Cho, {Kyung Hoon} and Park, {Hwi Yeol} and Ahn, {Cheol Woo} and Sahn Nahm and Kenji Uchino and Park, {Seung Ho} and Lee, {Hyeung Gyu} and Lee, {Hwack Joo}",

year = "2007",

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doi = "10.1111/j.1551-2916.2007.01715.x",

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AU - Nahm, Sahn

AU - Uchino, Kenji

AU - Park, Seung Ho

AU - Lee, Hyeung Gyu

AU - Lee, Hwack Joo

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N2 - The 0.95(Na0.5K0.5)NbO3-0.05SrTiO3 (0.95NKN-0.05ST) ceramics formed in this study had a porous microstructure with small grains and low piezoelectric properties due to their low density. However, when a small amount of Na2O was intentionally subtracted from the 0.95NKN-0.05ST ceramics, a liquid phase was formed, which led to increased density and grain size. Piezoelectric properties were also improved for the Na2O-subtracted 0.95NKN-0.05ST ceramics. The increased density and grain size were responsible for the enhancement of the piezoelectric properties. In particular, the 0.95(Na0.49K0.5)NbO2.995-0.05ST ceramics showed high piezoelectric properties of d33=220, kp=0.4, Qm=72, and ε3T/εo=1447, thereby demonstrating their promising potential as a candidate material for application to lead-free piezoelectric ceramics.

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