P. Lauginie et J. Conard, NEW GROWING MODES FOR CARBON - MODELIZATION OF LATTICE-DEFECTS, STRUCTURE OF TUBULES AND ONIONS, Journal of physics and chemistry of solids, 58(11), 1997, pp. 1949-1963
Topological defects and tubule-to-tubule connections on single-walled
carbon nanotubes are examined in the frame of dislocations and Burgers
vectors concepts. A tubule is defined by its Burgers vector on the gr
aphene triangular Bravais lattice. The 'adjacent pentagon + heptagon d
efect', in short '5 circle plus 7', is identified with a dislocation w
ith a lattice primitive vector as Burgers vector, i.e. a high-energy-h
ighly-mobile defect. It acts as an elementary translational operator o
n the triangular array, allowing the description of the set of transfo
rmations undergone by a tubule through a single 5 circle plus 7 in ter
ms of nearest neighbours jumps. The standard labelling system in use f
or tubules is extended into a unified system for tubules anl for chira
l and non-chiral icosahedral fullerenes, allowing easy relations betwe
en a tubule and the either flat or hemispherical caps able to match it
. Interest of these ideas in onions and multi-walled nanotubes is emph
asized. (C) 1997 Elsevier Science Ltd.