Structural studies of disordered carbons by high-energy X-ray diffraction

Hawelek, L. and Koloczek, J. and Brodka, A. and Dore, John C. and Honkimaki, V. and Burian, A. (2007) Structural studies of disordered carbons by high-energy X-ray diffraction. Philosophical Magazine, 87 (32). pp. 4973-4986. ISSN 1478-6435. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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X-ray diffraction measurements were carried out on three samples of disordered, commercially produced carbons, AX21, CXV and BP71, on the ID15B beam-line at the European Synchrotron Radiation Facility (ESRF), Grenoble. Intensity data were converted to pair correlation functions via the Fourier transform. The results obtained show that the structure of the studied samples consists of one four graphite-like layers, stacked without spatial correlations. The size of the ordered regions is in the range of 9-16 angstrom. The atomic arrangement within an individual layer can be described in terms of the paracrystalline ordering, in which lattice distortions propagate proportionally to the square root of interatomic distances. The paracrystalline structure was simulated by introducing the Stone Wales defects (pair of two pentagons and two heptagons), randomly distributed in the network. The resulting structures were relaxed using the reactive empirical bond order potential for carbon-carbon interaction and the Lennard-Jones potential with parameters for interlayer interactions. Such defects lead to curvature of individual layers.

Item Type: Article
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Maggie Francis
Date Deposited: 06 Oct 2009 11:20
Last Modified: 16 May 2014 14:42
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