Title
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Order, disorder and structure of crystals
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Author
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Abstract
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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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Language
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English
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Source (journal)
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Europhysics letters / Société européenne de physique. - Les Ulis, 1986, currens
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Publication
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Les Ulis
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Les éditions de physique
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1992
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ISSN
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0295-5075
1286-4854
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DOI
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10.1209/0295-5075/17/4/008
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Volume/pages
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17
:4
(1992)
, p. 327-332
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ISI
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A1992GV54200008
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Full text (Publisher's DOI)
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Full text (publisher's version - intranet only)
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