High-Intensity Transmission X-Ray Topography of Homogeneously Bent Crystals

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Abstract
Homogeneously elastically curved regions of otherwise perfect crystals are shown to give rise to area contrast images of the bent regions in transmission x‐ray topographs of the crystals. In addition, the homogeneous bending causes contrast asymmetries in the localized images of defects or other small‐strain fields in the Lang topographs of crystals. This intentional elastic bending of crystals containing defects will thus often provide a number of advantages over taking topographs of unbent crystals. For example, the exposure times may be reduced by more than an order of magnitude with little loss in resolution or contrast. Secondly, the sense of strain or Burgers vectors of defects may be determined even for thin or nonabsorbing crystals by using the intentionally bent portion of the crystal as a reference strain.