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X-Ray Methods for Detection of Lattice Imperfections in Crystals

Published online by Cambridge University Press:  06 March 2019

Volkmar Gerold
Volkmar Gerold*
Affiliation:
Institut fuer Metallphysik am Max Planck Institut fuer Metallforschung, Stuttgart, Germany
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Abstract

Two methods are described for the detection of lattice imperfections of different kinds.

  • 1. Imperfections in Solid Solutions. Normal diffraction methods with monochromatized X-rays are applied to single crystals of supersaturated solid solutions, where preprecipitation states occur. The calculated intensity distribution for a one-dimensional model of clustering shows the influence of atomic distribution and lattice distortion. Results are given on the structure of clusters in aluminum-rich alloys.

  • 2. Detection of Dislocations in Nearly Ideal Crystals. A method first given by Barth and Hosemann is improved and used for the detection of dislocations in crystals of germanium. Use is made of the anomalously low absorption coefficient existing for X-rays which make the Bragg angle with a certain set of lattice planes going through a perfect crystal. The absorption is increased at points where the lattice planes are distorted by a dislocation line, and shadows from these lines can be seen on a photographic plate behind the crystal. The method gives information on the spatial distribution of dislocation lines and the direction of the Burgers vectors,

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 3: Eighth Annual Conference on Applications of X-ray Analysis, August 12-14, 1959 , 1959 , pp. 289 - 313
Copyright
Copyright © International Centre for Diffraction Data 1959

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