Structure of C6H12 films on graphite

A. Razafitianamaharavo , P. Convert , J.P. Coulomb , B. Croset , N. Dupont-Pavlovsky

An X-ray and neutron scattering study of C6H12 adsorbed on graphite has been performed from 77 to 260 K. In the monolayer range, three solids have been observed ; they exhibit, in order of increasing density, a commensurate √7 . √7 structure (S1), an incommensurate hexagonal structure (S 2)' and a centered rectangular structure (S3 ). The melting temperature has been located at 240 K, and a tentative phase diagram has been proposed. Only one layer is adsorbed at 77 K before 3D condensation, whereas two layers are adsorbed at 233 K. The completion of the second layer occurs according to a first order transition process from a hexagonal monolayer (S2) to a centered rectangular bilayer (S3).

Mots clés: adsorbed layers; commensurate incommensurate transformations; monolayers; neutron diffraction examination of materials; organic compounds; surface phase transformations; X ray diffraction examination of materials

Domaines: Articles anciens

A. Razafitianamaharavo, P. Convert, J.P. Coulomb, B. Croset, N. Dupont-Pavlovsky. Structure of C6H12 films on graphite. Journal de Physique, 1989, 50 (20), pp.3133-3146. ⟨10.1051/jphys:0198900500200313300⟩. ⟨jpa-00211131⟩