Abstract
A detailed study of the transformation of graphitic structures into spherical onion-like particles under electron bombardment is presented. This evolution has been monitored up to the atomic details in a high-resolution electron microscope. The transformation from a tubular or polyhedral graphitic particle into a quasi-spherical onion is made in several steps, firstly the innermost shell collapses, then the regraphitization begins in the surface and follows towards the center by a sort of internal epitaxy.
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