Structural variation and piezoelectric properties of 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 ceramics

Cheol Woo Ahn; Hwi Yeol Park; Sahn Nahm; Kenji Uchino; Hyeung Gyu Lee; Hwack Joo Lee

doi:10.1016/j.sna.2006.10.036

Structural variation and piezoelectric properties of 0.95(Na_0.5K_0.5)NbO₃-0.05BaTiO₃ ceramics

Cheol Woo Ahn, Hwi Yeol Park, Sahn Nahm, Kenji Uchino, Hyeung Gyu Lee, Hwack Joo Lee

Department of Materials Science and Engineering

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

56 Citations (Scopus)

Abstract

A dense microstructure was developed for the 0.95(Na_0.5K_0.5)NbO₃-0.05BaTiO₃ (0.95NKN-0.05BT) ceramics sintered at above 1050 °C. Grain growth was observed in the specimens sintered at 1050-1060 °C while a liquid phase was found in the specimens sintered at above 1050 °C, which explained the increased sinterability and grain size. KTiNbO₅ and Ba₆Ti₂Nb₈O₃₀ second phases were also observed for the specimens sintered at above 1060 °C. Evaporation of Na₂O was responsible for the formation of the liquid phase and the KTiNbO₅ and Ba₆Ti₂Nb₈O₃₀ second phases. Muffling with 0.95NKN-0.05BT powders during the sintering improved the piezoelectric properties, possibly due to the increased poling efficiency resulting from the reduced Na₂O evaporation.

Original language	English
Pages (from-to)	255-260
Number of pages	6
Journal	Sensors and Actuators, A: Physical
Volume	136
Issue number	1
DOIs	https://doi.org/10.1016/j.sna.2006.10.036
Publication status	Published - 2007 May 1

Keywords

Alkaline niobate
Barium titanate
Lead-free piezoelectric ceramics

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Instrumentation
Condensed Matter Physics
Surfaces, Coatings and Films
Metals and Alloys
Electrical and Electronic Engineering

Access to Document

10.1016/j.sna.2006.10.036

Cite this

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title = "Structural variation and piezoelectric properties of 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 ceramics",

abstract = "A dense microstructure was developed for the 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 (0.95NKN-0.05BT) ceramics sintered at above 1050 °C. Grain growth was observed in the specimens sintered at 1050-1060 °C while a liquid phase was found in the specimens sintered at above 1050 °C, which explained the increased sinterability and grain size. KTiNbO5 and Ba6Ti2Nb8O30 second phases were also observed for the specimens sintered at above 1060 °C. Evaporation of Na2O was responsible for the formation of the liquid phase and the KTiNbO5 and Ba6Ti2Nb8O30 second phases. Muffling with 0.95NKN-0.05BT powders during the sintering improved the piezoelectric properties, possibly due to the increased poling efficiency resulting from the reduced Na2O evaporation.",

keywords = "Alkaline niobate, Barium titanate, Lead-free piezoelectric ceramics",

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

note = "Funding Information: This work was supported by the Basic Research Program of the Korea Science & Engineering Foundation with grant No. R01-2005-000-10289-0. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

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AU - Nahm, Sahn

AU - Uchino, Kenji

AU - Lee, Hyeung Gyu

AU - Lee, Hwack Joo

N1 - Funding Information: This work was supported by the Basic Research Program of the Korea Science & Engineering Foundation with grant No. R01-2005-000-10289-0. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

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N2 - A dense microstructure was developed for the 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 (0.95NKN-0.05BT) ceramics sintered at above 1050 °C. Grain growth was observed in the specimens sintered at 1050-1060 °C while a liquid phase was found in the specimens sintered at above 1050 °C, which explained the increased sinterability and grain size. KTiNbO5 and Ba6Ti2Nb8O30 second phases were also observed for the specimens sintered at above 1060 °C. Evaporation of Na2O was responsible for the formation of the liquid phase and the KTiNbO5 and Ba6Ti2Nb8O30 second phases. Muffling with 0.95NKN-0.05BT powders during the sintering improved the piezoelectric properties, possibly due to the increased poling efficiency resulting from the reduced Na2O evaporation.

AB - A dense microstructure was developed for the 0.95(Na0.5K0.5)NbO3-0.05BaTiO3 (0.95NKN-0.05BT) ceramics sintered at above 1050 °C. Grain growth was observed in the specimens sintered at 1050-1060 °C while a liquid phase was found in the specimens sintered at above 1050 °C, which explained the increased sinterability and grain size. KTiNbO5 and Ba6Ti2Nb8O30 second phases were also observed for the specimens sintered at above 1060 °C. Evaporation of Na2O was responsible for the formation of the liquid phase and the KTiNbO5 and Ba6Ti2Nb8O30 second phases. Muffling with 0.95NKN-0.05BT powders during the sintering improved the piezoelectric properties, possibly due to the increased poling efficiency resulting from the reduced Na2O evaporation.

KW - Alkaline niobate

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KW - Lead-free piezoelectric ceramics

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