Naomi Nishiki

Development of laboratory x-ray fluorescence holography equipment

Laboratory x-ray fluorescence holography equipment was developed. A single-bent graphite monochromator with a large curvature and a high-count-rate x-ray detection system were applied in this equipment. To evaluate the performance of this equipment, a hologram pattern of a gold single crystal was measured. It took two days, which was about one-third the time required for the previous measurements using the conventional x-ray source and several times that using the synchrotron source. The quality of the hologram pattern is as good as that obtained using the synchrotrons. Clear atomic images on (002) are reconstructed.

Graphite layer material

The present invention provides a graphite layer material to be used as an electrode material which exhibits excellent cell characteristics when used for a secondary cell. The graphite layer material of the present invention comprises highly oriented graphite layers of which a direction of crystalline orientation is adjusted to a planar direction, and an intercalant being inserted between the graphite layers.

Reversibly Bendable Pyrolytic Graphite Film and its Electronic Properties

A reversibly bendable graphite film has been prepared by the pyrolysis of a polyimide film at 2800°C. The graphite film can be bent reversibly and repeatedly by about 30° without inducing cracks on its surface. In addition, there is no variation of residual resistivity ratio and magnetoresistance, which are the index of the crystallinity, even with more than 100 bendings by about 30°. On the other hand by bending by more than 30° repeatedly, residual resistivity ratio and magnetoresistance slightly decreased. These results were interpreted by taking bending-induced defects in the graphite film into account.