Preparation of barium titanate-potassium niobate ceramics using interface engineering and their piezoelectric properties

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  • WADA Satoshi
    Material Science and Technology, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi
  • SHIMIZU Shigehito
    Material Science and Technology, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi
  • PULPAN Petr
    Material Science and Technology, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi
  • KUMADA Nobuhiro
    Material Science and Technology, Interdisciplinary Graduate School of Medical and Engineering, University of Yamanashi
  • TANAKA Daisuke
    Materials and Process Development Center, TDK Co., Ltd.
  • FURUKAWA Masahito
    Materials and Process Development Center, TDK Co., Ltd.
  • MORIYOSHI Chikako
    Department of Physical Science, Hiroshima University
  • KUROIWA Yoshihiro
    Department of Physical Science, Hiroshima University

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Barium titanate (BaTiO3, BT)–potassium niobate (KNbO3, KN) solid solution system (0.5BT–0.5KN) ceramics with various microstructures were prepared by two-step sintering method, and their piezoelectric properties were investigated. For 0.5BT–0.5KN ceramics, two phases, ferroelectric tetragonal and ferroelectric orthorhombic, coexisted in different grains at room temperature, owing to the limited solid solution system. The volume fraction of interface region between BT-rich tetragonal and KN-rich orthorhombic grains was controlled by sintering temperatures, and increased with decreasing sintering temperatures. Apparent piezoelectric constant d33* was measured using slope of strain vs. electric field curves. As the results, the d33* increased with decreasing sintering temperatures, which revealed that interface region between tetragonal and orthorhombic grains could contribute to enhancement of piezoelectric properties.

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