Order, disorder and structure of crystals of C60/C70

J. Bohr, D. Gibbs, S.K. Sinha, W. Krätschmer, G. Van Tendeloo, E. Larsen, H. Egsgaard, L.E. Berman

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Single crystals with two different morphologies, black and brown, of C60 with about 12% C70 have been studied by synchrotron X-ray diffraction. Integrated intensities from 8 reflections show that the charge distribution of the C60 cluster is shell-like giving rise to an oscillatory behaviour in the diffracted intensities. From the intensities, the distance between diametrically opposite carbon atoms has been determined to be (7.24 ± 0.22) Å. The thickness of the charge distribution of the shell can be estimated as 3.06 Å and the cavity within a C60 cluster to have a diameter of about 4.18 Å. The finite longitudinal width of the diffraction peaks from black crystals indicates a lack of long-range crystalline order. The rocking curves are about 7° broad and depict an unusually smooth behaviour. This may be indicative of a glassy or hexatic phase. High-resolution electron microscopy allows small crystallites with a relatively well-defined orientation relationship to be identified. In contrast, brown crystals have long-range order.
    Original languageEnglish
    JournalEPL
    Volume17
    Issue number4
    Pages (from-to)327-332
    ISSN0295-5075
    DOIs
    Publication statusPublished - 1992

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