Preparation and investigation of hexagonal-tetragonal BaTiO3 powders

Hari Shankar Mallik, Ichiro Fujii, Yoshio Matsui, Gopal Prasad Khanal, Sangwook Kim, Shintaro Ueno, Tohru S. Suzuki, Satoshi Wada*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Hexagonal-tetragonal co-existing barium titanate powders were prepared by reducing commercial barium titanate powders with their particle size of about 100 nm in a hydrogen atmosphere for 1 h at several temperatures, and the microstructures were observed. It was found that the hexagonal-tetragonal barium titanate powder had a co-existing hexagonal and tetragonal phase in a particle rather than a mixture of two phases in the powder. The hexagonal contents of about 0, 25, 50, 70, 85, and 100 wt % were obtained at temperatures of 1310, 1315, 1320, 1324, 1330, and 1333 °C, respectively. The hexagonal phase was returned to the tetragonal phase by annealing at 1200 °C in air. A model for the mechanism of a complete transformation of barium titanate polymorph from tetragonal/cubic to hexagonal phases is proposed.

Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalJournal of the Ceramic Society of Japan
Issue number2
Publication statusPublished - 2021 Feb
Externally publishedYes


  • Barium titanate powder
  • Co-existing
  • HM-EPD
  • Hexagonal-tetragonal
  • Hydrogen atmosphere

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry


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