Poling Treatment and Piezoelectric Properties of Potassium Niobate Ferroelectric Single Crystals
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概要
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Piezoelectric properties of potassium niobate (KNbO_3) single crystals were investigated as a function of crystallographic orientations. i.e., [110]_c of polar direction and [001]_c of nonpolar direction. Prior to the piezoelectric measurements, the optimum conditions for a conventional poling method were investigated, and it was found that the optimum conditions for a conventional poling method were as follows, i.e., (a) high temperature above 100℃, (b) long soaking time over 1h, (c) slow heating and cooling rates below 1℃/min, and (d) lower poling current below 1μA. However, fully poled KNbO_3 crystals were not obtained using the conventional poling method. Thus, to achieve fully poled KNb03 single crystals, a new 2-step poling method was proposed. This method is composed of 2 poling stages, i.e., the 1st step for non-180° domain switchings at higher temperatures under a low DC bias field, and the 2nd step for 180° domain switchings at lower temperatures under a high DC bias field. Using the 2-step poling method, KNbO_3 crystals were successfully poled, and then, their piezoelectric properties of k_<31> modes were measured using a resonance method. The [110]_c poled KNbO_3 crystals exhibited electromechanical coupling factor k_<31> of 28.9%; and piezoelectric constant d_<31> of 13.4pC/N while the [001]_c poled KNbO_3 crystals exhibited k_<31> of 31 2% and d_<31> of 51.7 pC/N. The piezoelectric constant d_<31> along nonpolar [001]_c direction was 2.8 times higher than that along polar [110]_c direction.
- 社団法人応用物理学会の論文
- 2001-09-30
著者
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Watanabe Satoshi
Advanced Research Laboratory Hitachi Ltd.
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和田 智志
Department Of Metallurgy And Ceramics Science Graduate School Of Science And Engineering Tokyo Insti
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和田 智史
東京工業大学大学院理工学研究科材料工学専攻
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TSURUMI Takaaki
Graduate School of Science and Engineering, Tokyo Institute of Technology
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Wada S
Faculty Of Engineering Yokohama National University
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Wada Satoshi
Department Of Physics Graduate School Of Science Tokyo University Of Science
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Wada Satoshi
Riken
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Tsurumi T
The Graduate School Of Sci. And Engineering Tokyo Inst. Of Technol.
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Tsurumi Takaaki
Department Of Inorganic Materials Faculty Of Engineering Tokyo Institute Of Technology
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Tsurumi Takaaki
The Graduate School Of Sci. And Engineering Tokyo Inst. Of Technol.
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SEIKE Akira
Department of Metallurgy and Ceramics Science, Graduate School of Science and Engineering, Tokyo Ins
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Wada Satoshi
Material Sci. And Technol. Interdisciplinary Graduate School Of Medical And Engineering Univ. Of Yam
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Tsurumi Takaaki
Department Of Metallurgy And Ceramics Science Graduate School Of Science And Engineering Tokyo Insti
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Wada Satoshi
Department Of Applied Physics Faculty Of Engineering Osaka City University
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Seike Akira
Department Of Metallurgy And Ceramics Science Graduate School Of Science And Engineering Tokyo Insti
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Wada Satoshi
Department of Applied Chemistry, Tokyo University of Agriculture & Technology,
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