Morphotropic Phase Boundary and Electrical Properties of Bisumuth Sodium Titanate. Potassium Niobate Solid-Solution Ceramics.

  • Ishii Hideki
    Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda, Chiba-ken 278-8510, Japan
  • Nagata Hajime
    Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda, Chiba-ken 278-8510, Japan
  • Takenaka Tadashi
    Faculty of Science and Technology, Science University of Tokyo, Yamazaki 2641, Noda, Chiba-ken 278-8510, Japan

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説明

A morphotropic phase boundary (MPB) between (Bi1/2Na1/2)TiO3 (rhombohedral system) and KNbO3 (orthorhombic system) was determined by using X-ray diffraction and dielectric measurements. A solid solution, (1 - x)(Bi1/2Na1/2)TiO3-xKNbO3 [BNTK-100x], shows a rhombohedral symmetry and orthorhombic symmetry at a composition of around 0 ≤ x ≤ 0.95 and 0.96 ≤ x ≤ 1.00, respectively. The dielectric constant, εs, at Curie temperature, Tc, was the largest value in the BNTK-96 system. From these results, the MPB of the BNTK system seems to exist in BNTK-96. The BNTK ceramics were confirmed to be ferroelectric by observing their hysteresis loops. Resistivities, ρ, of BNTK-100x (0.94 ≤ x ≤ 0.98) are 109-1012 Ω·cm. An electromechanical coupling factor, k33, of BNTK-96 is 0.16 which is an unsaturated value.

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