Determination of contrast factors for cubic slip-systems and their application in the microstructural characterization of binary Fm(3)over-barm materials

摘要

Theoretical attempts to rationalize the strain anisotropy of crystalline systems in terms of dislocations often include the calculation of contrast factors. However, the evaluation of such parameters can be cumbersome because elastic properties and symmetry restraints must be simultaneously taken into account, especially when calculating the distortion tensor and the elastic contributions in slip coordinate systems. In this study, a dislocation-dependent coordinate system is introduced to obtain straightforward expressions for the evaluation of individual contrast factors by a first principles approach. Therein, we report the contrast factors for KCl and NaCl regarding edge and screw dislocations; a further analysis of their microstructure was carried out through the modified Williamson-Hall method.