Comparison between simulated weak-beam images: application to the extinction criterion in elastically anisotropic crystals

摘要

This paper investigates the reasons why the weak-beam contrast of dislocations is largely insensitive to elastic anisotropy. Particular attention is paid to the applicability of the g.b = 0 invisibility criterion for Burgers vector determination to crystals with large elastic anisotropy factors. For this purpose, a method has been designed to allow for a direct comparison between weak-beam images simulated under different g.b imaging conditions. [References: 17]