First X-ray diffraction analysis of pressure polymerized C60 single crystals
Laboratoire de Physique des Solides, URA CNRS 02,
Université Paris-Sud, 91405 Orsay, France
2 Department of Experimental Physics, Umeå University, S-90187 Umeå Sweden
Accepted: 22 August 1997
It is shown that single crystals can be polymerized under relatively modest pressure-temperature conditions. The resulting single crystals exhibit long-range order and they are made up of 12 orientation variants. The structure is orthorhombic with a short intermolecular distance along the chains (9.14 Å), characteristic of covalent bonding. We propose a structural mechanism for the polymerization of fullerene-based compounds; it involves a shift of one of the (111) cubic planes together with a shortening of the (111) spacing. The configuration of the polymer chains presents interesting relations with that found in the polymer compounds.
PACS: 61.48.+c – Fullerenes and fullerene-related materials / 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects
© EDP Sciences, 1997