TY - JOUR
T1 - Preparation and investigation of hexagonal-tetragonal BaTiO3 powders
AU - Mallik, Hari Shankar
AU - Fujii, Ichiro
AU - Matsui, Yoshio
AU - Khanal, Gopal Prasad
AU - Kim, Sangwook
AU - Ueno, Shintaro
AU - Suzuki, Tohru S.
AU - Wada, Satoshi
N1 - Funding Information:
Acknowledgement We would like to thank the Graduate Program for Power Energy Professionals (PEP), Waseda University from the MEXT WISE Program for partial support of this work. We would also like to thank Sakai Chemical Industry Co., Ltd., for providing BT01 powder.
Publisher Copyright:
© 2021 The Ceramic Society of Japan. All rights reserved.
PY - 2021/2
Y1 - 2021/2
N2 - 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.
AB - 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.
KW - Barium titanate powder
KW - Co-existing
KW - HM-EPD
KW - Hexagonal-tetragonal
KW - Hydrogen atmosphere
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U2 - 10.2109/jcersj2.20186
DO - 10.2109/jcersj2.20186
M3 - Article
AN - SCOPUS:85101739178
SN - 1882-0743
VL - 129
SP - 91
EP - 96
JO - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
JF - Nippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
IS - 2
ER -