Title
Order, disorder and structure of crystals <tex>$C_{60}/C_{70}$</tex> Order, disorder and structure of crystals <tex>$C_{60}/C_{70}$</tex>
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Paris ,
Subject
Physics
Source (journal)
Europhysics letters. - Paris
Volume/pages
17(1992) :4 , p. 327-332
ISSN
0295-5075
ISI
A1992GV54200008
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
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) angstrom. The thickness of the charge distribution of the shell can be estimated as 3.06 angstrom and the cavity within a C60 cluster to have a diameter of about 4.18 angstrom. 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-degrees 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.
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