Study of the structures of intercalate layer in metal chloridegraphite intercalation compounds by using EXAFS and XANES

Abstract

The structures of intercalate layer in several metal chloride-graphite intercalation compounds (GIC_s) were studied by the analysis of extended X-ray absorption fine structure (EXAFS) and X-ray absorption near-edge structure (XANES). The intercalated CuCl₂ in CuCl₂-GIC maintains a similar layer structure with long-range-order to that in anhydrous CuCl₂ crystal. The structure of intercalated iron chloride in its GIC obtained in FeCl₃-KCl molten salt is similar to that in the ternary GICs with iron chloride and nickel chloride, which are synthesized by using either a mixture of FeCl₃ and NiCl₂ or a FeCl₃-NiCl₂-KCl molten salt. In these ternary compounds, iron and nickel chlorides intercalated have a long-range-order in their layers and seem to exist in separated domains.