Raman Scattering Study of FeCl3 Based Graphite Bi-Intercalation Compounds

Abstract

FeCl3-IBr, -ICI, and -SbCl5 -graphite bi-intercalation compounds (GBC's) have been synthesized from a stage 4 FeCI3 -graphite intercalation compound (GIC). and their lattice dynamics has been investigated by Raman spectroscopy. First, layer sequences of these GBC's were determined by x-ray diffraction, and the sequence was determined to be G(FeCl3)G1G2(1)G3G4(FeCI3)G. where Gn, (FeCl3), and (1) refer to the nth graphite, FeCl3, and bi-intercalate layers, respectively. The sequences were the same irrespective of bi-intercalated species. These GBC's give only one peak identified as Raman active mode frequency in the Raman spectra. The peak frequencies were found to be affected by bi-intercalated species, and the frequencies were in the order of IBr <ICI <SbCl5. From this result, the degree of charge transfer was determined to be in the order of IBr < ICI < SbCl5.