TEM STUDIES OF METAL DICHLORIDE AND METAL TRICHLORIDE GRAPHITE-INTERCALATION COMPOUNDS

Transmission electron microscopy (TEM) studies have been carried out on stage 1 and stage 2 CoCl2-GIC and CuCl2-GIC. These studies show that the intercalate has crystallographic coherence lengths of the order of 1 mu m in the basal plane, whereas the continuity length may be of the order of 200 AA. The structure of InCl3-GIC has also been studied and two new phases have been discovered: a nearly commensurate square root 7* square root 7 R19.1 degrees phase believed to be stage 1; and an aligned incommensurate phase believed to be of high stage. The nearly commensurate square root 7* square root 7 R19.1 degrees phase displays both crystallographic coherence lengths and continuity lengths of the order of 1 mu m.