A discussion of the influence of partial dislocations on the intensity of Bragg reflections

The analysis of elastic scattering experiments is considered for the case of crystals with lattice dislocations present. It is shown that somedislocations (known as partial dislocations. or Shockley partials) may give rise to a systematic change in the integntd intensities of Bra= reflections. These changes may involve additional atomic positions in the smcture. A theory is developed for the description of the average intensity of a Bragg reflection for crystals with partial dislocations present. The example of Ni$n in its hexagonal configuration is discussed.