X-ray and neutron scattering by different dislocation ensembles

Dislocations cause long-range displacement fields in the crystals. In bulk crystals they belong to so-called 2nd kind defects. The results of simulati ons of scattering intensity on several types of dislocation distributions i n bulk crystals and in thin films are presented in the paper. The presence of the surface changes both the distortions and the regularities of scatter ing phenomena in thin films when compared to the bulk. Diffraction phenomen a on misfit dislocations have some additional peculiarities compared with t he bulk crystals. The input of each system of misfit dislocations into the broadening of the rocking curve depends on the angle between the diffractio n vector and the direction of dislocation lines in the system. (C) 2001 Els evier Science B.V. All rights reserved.