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Oral presentation

Control of diameter of SiC nano-fiber by ion beam and EB irradiation

Sugimoto, Masaki; Yoshimura, Kimio; Idesaki, Akira; Yoshikawa, Masahito; Asano, Atsushi*; Seki, Shu*; Tsukuda, Satoshi*; Tanaka, Shunichiro*

no journal, , 

no abstracts in English

Oral presentation

Li diffusion path in LiMn$$_{2}$$O$$_{4}$$ analyzed by neutron diffraction

Igawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu; Shamoto, Shinichi

no journal, , 

The crystal structure of LiMn$$_{2}$$O$$_{4}$$ was analyzed by the Rietveld method using the neutron powder diffraction, and the neutron scattering length density map was analyzed for the investigation of the Li conduction path by the maximum entropy method. The crystal structure could be refined with the space group, ${it Fd}$-3${it m}$ with a lattice constant, ${it a}$ = 8.2442(3) ${AA}$ at room temperature. We estimated that Li, Mn and O atoms were occupied at 8${it b}$, 16${it c}$ and 32${it e}$ sites, respectively. And the cation mixing between Li and metal sites was not observed. Three-dimensional Li diffusion path was observed in the neutron scattering length density map analyzed by maximum entropy method.

Oral presentation

Synthesis of single-crystalline Si$$_{3}$$N$$_{4}$$ nanomaterials and their morphology change

Taguchi, Tomitsugu; Shamoto, Shinichi

no journal, , 

Several types of single crystalline Si$$_{3}$$N$$_{4}$$ nanomaterials were synthesized by heat treatment of Si powder. In the case of heat temperature at 1300 $$^{circ}$$C, almost all products were Si$$_{3}$$N$$_{4}$$ nanowires. On the other hand, the suspended Si$$_{3}$$N$$_{4}$$ nanosheets with a width wider than 3 $$mu$$m and a thickness range of 1.5-4 nm were synthesized for the first time by the heat treatment at 1400 $$^{circ}$$C. Several nanosheets have scrolled edges possibly due to their ultra-thin thickness.

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