Diffraction contrast factor of dislocations:The case of scheelite CaWO_4

摘要

Dislocations are known for their peculiar effects on the diffraction profiles. Eachgiven dislocation type, produces specific anisotropic line broadening basically determined bythe so-called contrast factor (CF). Owing to the lack of a suitable mathematical frame to dealwith dislocations in crystal of any symmetry, CFs have been so far determined for highsymmetry materials. In this work we present the main points of a general approach for de-termining CF, as well as a specific application to scheelite CaWO4.