Abstract
A method for radial distribution function (RDF) analysis of solid carbons is proposed, to enable determination of essential structural features, starting with the most general ones: applicability of the graphite-like layers model; and correlation between atom positions in neighbouring layers. A general model of an average layer is considered in terms of the different ways the coordination numbers are attenuated. Some frame models of structure are described, and the results of performing RDF analysis are discussed. In particular the influence of a chosen frame model on a reference background of radial density is considered. This approach is applied to RDF analysis of two heat-treated extracts of low rank Polish coals.
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