Low temperature synthesis of tetragonal BaTiO3 by using molten salt

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  • KUMADA Nobuhiro
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • OGISO Hideyuki
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • WADA Satoshi
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • YONESAKI Yoshinori
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • TAKEI Takahiro
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • KINOMURA Nobukazu
    Department of Research Interdisciplinary Graduate School of Medicine and Engineering, University of Yamanashi
  • IIJIMA Takashi
    Research Center for Hydrogen Industrial Use and Storage, National Institute of Advanced Industrial Science and Technology
  • WATANABE Takayuki
    Core Technology Development Headquarters, CANON INC.

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Tetragonal BaTiO3 was prepared by reaction of a layered K2Ti2O5 and mixed barium salts (BaCl2 + Ba(NO3)2) at above 700°C. The morphology of the particle was cubic shape and the particle size of the products prepared at 700–1000°C was ∼10 µm, and that of the products prepared at higher temperatures (1100–1200°C) was smaller than that of the products prepared at 700–1000°C. From the chemical analysis no potassium atom was detected and the Ba/Ti ratio in the tetragonal BaTiO3 was 1.00. In the cubic particle of the tetragonal BaTiO3 surface 90° domain boundaries were observed. Lattice parameters and Curie temperature of the tetragonal BaTiO3 were a = 3.995(1) and c = 4.036(1) Å and 130°C, respectively.

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