Articles - Effect of heat treatment on microstructure of BaTiO3 solidified by aerodynamic levitator
- Chi-hoon Leea, Ki-Ju Leea, Hyung Giun Kimb, Sung Hwan Limc, M.S. Vijaya Kumard, Shinichi Yodad and Won-Seung Choa,*
- a School of Materials Science and Engineering, Inha University, 253 Younghyun-Dong, Nam-Gu, Incheon, 402-751, Korea b Gangwon Regional Division, Korea Institute of Industrial Technology, Gangneung 210-340, Korea c Department of Advanced Materials Science and Engineering, Kangwon National University,Chuncheon 200-701, Korea d Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo-ward, Sagamihara, Kanagawa, 252-5210, Japan
Abstract
BaTiO3 was solidified using an aerodynamic levitator. The effect of heat treatment on microstructure of BaTiO3 was investigated. Domain walls with a width of ~ 400 nm were observed in the BaTiO3 grains. The composition shift from stoichiometric BaTiO3 to a Ti- or TiO2-rich composition was attributed to the evaporation of BaO. Ti-rich Ba6Ti17O40 was formed by a reaction with excess TiO2 and BaTiO3 during heat treatment at 1000 oC. A diffuse-interface was observed, indicating that Ba6Ti17O40 had formed by atomic diffusion.
Keywords: Aerodynamic levitation, BaTiO3, domain, Ba6Ti17O40, Transmission electron microscopy.
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