Topographic Study on Staging Transition in H2SO4-Graphite Intercalation Compound by in situ Raman Scattering Measurements

The staging kinetics in H 2 SO 4 -GIC's has been investigated experimentally by time-and space-dependent Raman scattering measurements. The stage transition from stage n to n -1 begins at the interface between the intercalant reservoir and the a -face of the graphite crystal. The lower stage-( n - 1) domains emerge at the interface and proceed toward the inner region of the crystal. A narrow phase-boundary between different stage domains exists in the localized region and move toward the inner region as the stage transformation progresses. The present results support the model [R. Nishitani, Y. Uno and H. Suematsu: Synth. Met. 7 (1983) 13] that the stage transformation proceeds via propagation of the boundary between well-staged regions. The origin of the stage disorder is also discussed.

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