Low temperature synthesis of tetragonal BaTiO3 by using molten salt

Nobuhiro KUMADA; Hideyuki OGISO; Satoshi WADA; Yoshinori YONESAKI; Takahiro TAKEI; Nobukazu KINOMURA; Takashi IIJIMA; Takayuki WATANABE

doi:10.2109/jcersj2.118.738

Feature: Evolution of Dielectric Materials: Notes

Low temperature synthesis of tetragonal BaTiO₃ by using molten salt

Nobuhiro KUMADA, Hideyuki OGISO, Satoshi WADA, Yoshinori YONESAKI, Takahiro TAKEI, Nobukazu KINOMURA, Takashi IIJIMA, Takayuki WATANABE

Author information

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

Keywords: Tetragonal BaTiO₃, Molten salt synthesis, Layered titanate

JOURNAL FREE ACCESS

2010 Volume 118 Issue 1380 Pages 738-740

DOI https://doi.org/10.2109/jcersj2.118.738

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Abstract

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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