Miho Ito
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Publication
Featured researches published by Miho Ito.
Journal of The Ceramic Society of Japan | 2005
Jun Hasegawa; Miho Ito; Shohei Itoh; Tetsuo Kondo
Density functional theory calculations were performed to analyze atomic and electronic structures of cordierite. The most stable configuration of Al and Si atoms in the six-membered ring of a unit cell was decided by geometry optimizations for sixteen different initial structures. A correlation was observed between the number of Al-O-Al bonds in a unit cell and the lattice energy. We concluded that the number of Al-O-Al bonds is a determining factor of the lattice stability. The structural parameters of the most stable crystal structure obtained by geometry optimization agreed well with the experimental observation. According to the distribution of atomic charges and analysis of bond order, the followings were clarified: (i) the covalent bond in a T1 tetrahedron was stronger than that in a T2 tetrahedron, (ii) the covalent bond of a cation in six-membered ring with O atoms in a T1 tetrahedron was the weakest, and (iii) Mg in the cordierite is of ionic nature.
Japanese Journal of Applied Physics | 2014
Jun Kano; Takumi Okamoto; Shin Nakamura; Akio Fuwa; Takafumi Otoyama; Yoshiaki Nakazaki; Hideki Hashimoto; Jun Takada; Norihiro Oshime; Miho Ito; Naoshi Ikeda
Various types of iron oxides loaded on ferroelectric BaTiO3 and nonferroelectric ZrO2 supports have been studied by 57Fe Mossbauer spectroscopy to investigate the valence instability of iron oxides affected by ferroelectric polarization fluctuation. Although the iron oxide loaded on ZrO2 shows a typical reduction process at high vacuum and high temperature, the iron oxide loaded on BaTiO3 shows an opposite process, i.e., iron oxide oxidization. We propose the dynamics of band structures of ferroelectrics in the paraelectric phase to understand this phenomenon. The oscillation of band bending causes electron transfer from an iron oxide to a ferroelectric support. This result suggests that the surface charges of ferroelectrics are useful in developing new functional materials with metal compounds.
Archive | 2003
Jun Hasegawa; Yamato Hayashi; Miho Ito; Tadachika Nakayama; Koichi Niihara; Mariko Sato; 忠親 中山; みほ 伊藤; 満里子 佐藤; 晧一 新原; 大和 林; 順 長谷川
Archive | 2002
Miho Ito; Jun Hasegawa; Koichi Niihara; Tadachika Nakayama
Archive | 1999
Miho Ito; Kenichiro Kami; Ryuichiro Shinkai; Hiroshi Uejima; Kyohei Usami; 啓史 上嶋; みほ 伊藤; 謙一郎 加美; 恭平 宇佐美; 竜一郎 新開
Archive | 1999
Miho Ito; Naohiro Kubota; Nobuya Mashita; Kyohei Usami; 直宏 久保田; みほ 伊藤; 恭平 宇佐美; 伸弥 真下
Archive | 1998
Kyohei Usami; Miho Ito; Naohiro Kubota; Shinya Mashimo
Archive | 2002
Masakazu Tanaka; Tomomi Hase; Takashi Kondo; Tosiharu Kondo; Hiromi Sano; Jun Hasegawa; Miho Ito; Tomohiko Nakanishi; Kazuhiko Koike; Takumi Suzawa
Chemical Physics Letters | 2014
Fumitaka Mafuné; Takumi Okamoto; Miho Ito
Archive | 2002
Takumi Suzawa; Masakazu Tanaka; Kazuhiko Koike; Miho Ito