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Section Topography as Single-Crystal Interferometry

A theoretical and experimental investigation of the behaviour of beam paths and phases in the elastic stress field of a dislocation within the Borrmann fan is presented. The relationship between the geometry of extinction contours and the diffraction power of the elastic stress field of the dislocation is discussed. It is demonstrated that the pattern of extinction contours can be used for an interferometric investigation of the elastic stress field. The methods are suggested for the analysis of the experimental section topographs, enabling to determine the value and the sign of the Burgers vector. 
 
 
 
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