Graphite consists of hexagonal carbon planes stacked along c-axis by weak van der Waals force. Therefore, many substances, what is called intercalates, can enter into the gallery of the graphite to form graphite intercalation compounds (GICs). The GICs have a unique stage structure. Stage is defined as number of graphene layer between intercalates. When some atoms or molecules enter into graphite at every two layers, the GIC possess the stage 2 structure. In the higher stage GICs, intercalates are regarded as a pseudo two dimensional structure, and therefore, much work has been done on the GICs in terms of transport properties, magnetic properties, lattice dynamics, etc.
We have focused 1) the fabrication of new graphite bi-intercalation compounds, in which two different intercalates exist in graphite, 2) novel synthesizes of alkali metal-GICs, and 3) physical and chemical properties of various stages of ferric chloride GICs. Followings are typical related papers:
1) Raman scattering study of acceptor-acceptor type graphite bi-intercalation compounds
Takeshi Abe, Minoru Inaba and Zempachi Ogumi, Yasukazu Yokota and Yasuo Mizutani
Physical Review B, 61, 11344 - 11347 (2000).
2) Graphite intercalation compounds prepared in solutions of alkali metals-2-methyltetrahydrofuran and -2,5-dimethyltetrahydrofuran
Yasuo Mizutani, Takeshi Abe, Kazuhiro Ikeda, Eiji Ihara, Mitsuru Asano, Toshio Harada, Minoru Inaba, and Zempachi Ogumi
Carbon 35, 61-65 (1997).
3) X-ray diffraction and Raman scattering studies of FeCl3-SbCl5-graphite bi-intercalation compounds
Takeshi Abe, Yasukazu Yokota, Yasuo Mizutani, Mitsuru Asano, Toshio Harada, Minoru Inaba, and Zempachi Ogumi
Journal of Materials Research 11, 3039-3044 (1996).
4) Bi-intercalation of ICl into a stage-5 FeCl3 graphite intercalation compound
Takeshi Abe, Yasukazu Yokota, Yasuo Mizutani, Mitsuru Asano, and Toshio Harada
Physical Review B52, 14159-14162 (1995).
5) Preparation of FeCl3-IBr-H2SO4-graphite multi-intercalation compounds
Takeshi Abe, Yasuo Mizutani, Eiji Ihara, Mitsuru Asano, and Toshio Harada
Journal of Materials Research, 9, 377-382 (1994).