Two sets of specimens were compressed at 2GPa and 1060 to 1760K; one in which graphitization was promoted by the presence of water and another in which graphitization was essentially absent. The X-ray diffraction peak profiles of both sets were analyzed by using the modified Williamson–Hall method and by fitting the Fourier coefficients of the measured profiles using theoretical functions for crystallite size and lattice strain. These procedures determined the mean size and size distribution of the crystallites as well as the density and the character of the dislocations. The same experimental conditions resulted in different microstructures for the 2 sets of samples. They were explained in terms of the hydrostatic conditions which were present in the graphitized samples.

Dislocation Density and Graphitization of Diamond Crystals. C.Pantea, J.Gubicza, T.Ungar, G.A.Voronin, T.W.Zerda: Physical Review B, 2002, 66[9], 094106 (6pp)