Characterization of unordered carbon using Warren-Bodenstein's equation

A new method is presented for characterizing the microstructure of unordered carbon, in which the observed X-ray diffraction pattern is assumed to be the superposition of the patterns of component crystallites of differing heights L-c and widths La but fixed interlayer spacing d(002), calculated using Wauen-Bodenstein's equation. The weights of the components are obtained from a least squares analysis and used to calculate mean values <L-a> and <L-c>. Results obtained from analysis of X-ray measurements of mesocarbon microbeads heat-treated in the range 700 to 1400 degreesC are compared with those obtained from analyses by Diamond's method for single layer plane distributions and Hirsch's method for layer plane distributions. (C) 2001 Elsevier Science Ltd. All rights reserved.