Heterocomplex-based graphite lamellar compounds: C22CuAl2Cl8.5 and C10Cd0.2AlCl3.7: Intercalation pathway, structure and transport

Exhaustive inventory of 2D unit cells commensurate with honeycomb graphene structure

“…3 (108,1) Rectangular 1 (36,3) Rectangular 2 (27,4) Rectangular 3 (12,9) Rectangular 4 (28,4) Oblique (100.89°) 5 (16,7) Oblique (100.89°) 6 (13,9) Oblique (106.10°) 7 (16,9) Oblique (120°) 8 (12,12) Hexagonal 9 Fig. 3.…”

“…The relationship (2) We have to reject the (61,1), (63,1), (21,3) and (9,7) pairs, because the associated unit cells do not correspond to N = 16. On the other hand, we have to reject also six other unit cells, which are strictly identical one from each other (same 2D crystal, as discussed for N = 10) so that the (13,4) cell with the smallest c angle is enough to represent all seven. Finally, only two unit cells have to be considered: (7,7) and (13,4).…”

“…On the other hand, we have to reject also six other unit cells, which are strictly identical one from each other (same 2D crystal, as discussed for N = 10) so that the (13,4) cell with the smallest c angle is enough to represent all seven. Finally, only two unit cells have to be considered: (7,7) and (13,4). These unit cells possess respectively a c angle equal to 97.22°and 105.18°.…”

“…Even if intercalated acceptors are no-commensurate in most cases, epitaxy can however been observed in some rare cases. For instance, McRae et al performed the intercalation of the CdAl 2 Cl 8 heteromolecule into graphite and showed that the as prepared first stage C 10 Cd 0.2 AlCl 3.7 GIC adopts an in-plane rectangular unit cell commensurate with the graphitic one [13]. The lattice constants of the intercalated sheet given by these authors are a = 1277 pm; b = 1228 pm, leading to A = 27 and B = 25 in our model, with N = 60.…”

“…Vector coordinates (u,v) and (w,z) for possible commensurate cells Finally, it can be retrieved four oblique unit cells, which correspond to the following (A,B) and c features: (28,4) and c = 100.89° ( 16,7) and c = 100.89° ( 13,9) and c = 106.10° ( 16,9) and c = 120°A ccording to the relationship (1), it is noticeable that the c angle possesses the same value when the AB product is identical for various (A,B) pairs, provided that N is fixed. Table 7 presents the nine unit cells for N = 24.…”