Preparation of BaTiO3 ultrafine particles by micro-emulsion charring method |
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| Authors: | Ryosuke Ueyama Masahiro Harada Tamotu Ueyama Takashi Yamamoto Tadashi Shiosaki Kiyoshi Kuribayashi Kunihito Koumoto Won Son Seo |
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| Affiliation: | (1) Daiken Chemical Industry Corporation Limited, 2-7-19 Hanaten-nishi, Jyto, Osaka, 536-0011, Japan;(2) Department of Electrical Engineering, National Defense Academy, 1-10-20 Hasirimizu, Yokosuka-city, Kanagawa, 239-0811, Japan;(3) Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma-city, Nara, 630-0101, Japan;(4) Department of Materials, Teikyo University of Science and Technology, 2525 Yatuzawa, Uenohara-Machi, Yamanashi, 409-0133, Japan;(5) Nagoya University, 1 banchi furou-cho Tigusa-ku, Nagoya-city Aichi, 464-0814, Japan |
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| Abstract: | Ultrafine BaTiO3 particles were prepared by a micro-emulsion charring (MEC) method. The MEC method consisted of two steps. The first step is the preparation of a water/oil micro-emulsion with BaTiO3 elements, and the second is a low temperature firing process in N2 atmosphere, which includes charring of oil in an emulsion and powdering BaTiO3 particles with the char. The char formed around BaTiO3 particles prevents an agglomeration of BaTiO3 particles during firing. In the present experiment, the W/O ratio and the amount of emulsifier greatly influenced the size of droplets of the emulsion. The charring temperature was another important experimental factor in order to obtain the desired BaTiO3 particles. The finally obtained BaTiO3 charring powders were monodispersed spherical particles and the particle size was 0.1  m to 0.5 m. |
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