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

Materials Research Institute (MRI)

Research output: Contribution to journal › Article › peer-review

64 Scopus citations

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 (US)
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
State	Published - Jun 2007

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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10.1111/j.1551-2916.2007.01715.x

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

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",

month = jun,

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

language = "English (US)",

volume = "90",

pages = "1946--1949",

journal = "Journal of the American Ceramic Society",

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T1 - Microstructure and piezoelectric properties of 0.95(Na0.5K 0.5)NbO3-0.05SrTiO3 ceramics

AU - Cho, Kyung Hoon

AU - Park, Hwi Yeol

AU - Ahn, Cheol Woo

AU - Nahm, Sahn

AU - Uchino, Kenji

AU - Park, Seung Ho

AU - Lee, Hyeung Gyu

AU - Lee, Hwack Joo

PY - 2007/6

Y1 - 2007/6

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.

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

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