A sensitive method for detecting long-range strain in nearly perfect crystals using X-ray dynamical diffraction

A very sensitive method is proposed for the detection of long-range strain in otherwise perfect crystalline materials. In this method, the specimen is rotated around the scattering vector in the symmetrical Laue case. Long-range strains due to a uniform bending or torsion, that are not detectable with the symmetrical Laue condition, are sensitively detected by the proposed method of rotating the specimen. Several demonstrative topographic observations are presented. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)