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Intercalation of rare earth metals in graphite

1980; Elsevier BV; Volume: 99; Issue: 1-4 Linguagem: Inglês

10.1016/0378-4363(80)90282-x

1873-2127

M. El Makrini, D. Guérard, Philippe Lagrange, A. Hérold,

Graphene research and applications

Like lithium and alkaline-earth metals, some lanthanides are able to give intercalation compounds with graphite. The intercalation is obtained either by action on the graphite of the vapor of the metal or by compression and heating of mixtures of graphite and metal powders. The structure of the 1st stage compounds EuC6 and YbC6 was determined with oriented samples by separate study of the different families of reflections: 00l with samples prepared from prolytic graphite, hk0 and hkl with single crystals. The hexagonal unit cell of these 1st stage phases belongs to the space group P63/mmc with two metal atoms in position b and 12 carbon atoms in i. The parameters are respectively, a = 4.314 ± 0.003 Å, c = 9.745 ± 0.008 Å (EuC6) and a = 4.320 ± 0.004 Å, c = 9.147 ± 0.004 Å (YbC6).