Piezoelectric anomalies at the ferroelastic phase transitions of lead-free tungsten bronze ferroelectrics
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概要
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This paper reports on the piezoelectric anomalies at the temperature or composition-induced ferroelastic phase transitions of tungsten bronze ferroelectrics. First, the temperature-dependent piezoelectric properties of Sr1.9Ca0.1NaNb5O15 (SCNN) ceramics were characterized using a resonance/anti-resonance method. SCNN has a ferroelastic phase transition manifested by a broad dielectric peak in the temperature range of −60°C to 20°C. The electromechanical coupling factor and elastic compliance showed the maximum at −40°C, increasing the transverse piezoelectric constant (d31) by 38% compared with the room temperature value. Tungsten bronze ferroelectrics follow a trade-off relationship between the longitudinal piezoelectric constant (d33) and the Curie temperature, while SCNN deviates significantly from the trend curve. This deviation is attributed to the ferroelastic phase transition close to room temperature.Second, the ferroelastic phase transition was investigated for epitaxial films of (1 − x)(Sr3Ba2)Nb10O30–xBa4Bi2/3Nb10O30 as a function of the composition. A careful structural analysis by X-ray diffraction revealed that there is a ferroelastic phase boundary between tetragonal and orthorhombic crystals at x = 0.06–0.3. The electric field-induced strain and the relative dielectric constants characterized at 80 K for the epitaxial films increased in the vicinity of the phase boundary composition. These results suggest that engineering the ferroelastic phase transition is an approach to improving the piezoelectric properties of lead-free tungsten bronze ferroelectrics.
著者
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FUNAKUBO Hiroshi
Department of Innovative and Engineered Materials, Interdisciplinary Graduate School, Tokyo Institut
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Kumada Nobuhiro
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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Watanabe Takayuki
Corporate R&D Headquarters, CANON INC.
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Hayashi Jumpei
Corporate R&D Headquarters, CANON INC.
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Matsuda Takanori
Corporate R&D Headquarters, CANON INC.
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IFUKU Toshihiro
Corporate R&D Headquarters, CANON INC.
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LEE Bong-Yeon
Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial S
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IIJIMA Takashi
Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial S
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YU Houzhona
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of
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Funakubo Hiroshi
Department Of Innovative And Engineered Materials
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Watanabe Toshihide
Atr Adaptive Communications Research Laboratories:(present Address)nhk Science And Technical Researc
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Kumada Nobuhiro
Department Of Research Interdisciplinary Graduate School Of Medicine And Engineering University Of Y
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Watanabe T
Department Of Innovative And Engineered Materials Interdisciplinary Graduate School Of Science And E
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Iijima Takashi
Research Center For Hydrogen Industrial Use And Storage National Institute Of Advanced Industrial Sc
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MATSUDA Takanori
Corporate R&D Headquarters, CANON INC.
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Kumada Nobuhiro
Department of Research Interdisciplinary Graduate School of Medicine and Engineering
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YU Houzhona
Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
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LEE Bong-Yeon
Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology (AIST)
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IFUKU Toshihiro
Corporate R&D Headquarters, CANON INC.
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WATANABE Takayuki
Corporate R&D Headquarters, CANON INC.
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IIJIMA Takashi
Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology (AIST)
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Funakubo Hiroshi
Department of Innovative and Engineered Material, Tokyo Institute of Technology, Yokohama 226-8503, Japan
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Hayashi Jumpei
Corporate R&D Headquarters, Canon Inc., Ota, Tokyo 146-8501, Japan
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HAYASHI Jumpei
Corporate R&D Headquarters, CANON INC.
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