Dislocations are known for their peculiar effect on the diffraction line profile. Each given dislocation type, defined by the slip system and dislocation character, produces a specific anisotropic line broadening basically determined by the so-called Contrast Factor (CF). The determination of CFs is made difficult by a complex elastic strain and geometrical problem, which is strongly dependent on the symmetry of the crystal lattice. As a consequence, CF calculations were so far limited to some high symmetry - cubic and hexagonal - lattices. In the present work a general algorithm is presented for the calculation of CFs for any dislocation configuration and lattice symmetry. It will be shown that numerical values can be obtained in the general case, and that explicit analytical expressions can be found in some relevant cases.

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