  The stress-strain anisotropy -including both elastic properties and
dislocation distributions- of crystalline systems can be studied using a
dislocation model proposed by Ung\'ar and Borb\'ely. However this model
requires fundamental parameters (i.e., contrast factors), which take into
account both the elastic properties and symmetry for each system. In this
study, such contrast factors were calculated from first principles for cubic
slip-systems through the evaluation of the distortion tensor in a
dislocation-dependent coordinate set. Moreover, a straightforward expression
for the computation of contrast factors is provided. Further analysis of the
microstructural parameters was carried out using the modified Williamson-Hall
method to characterize rock-salt materials.
