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Black‐white contrast figures from small dislocation loops II. Application of the first order solution to small loops in ion‐irradiated tungsten foils
Author(s) -
Häussermann F.,
Rühle M.,
Wilkens M.
Publication year - 1972
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2220500204
Subject(s) - tungsten , dislocation , contrast (vision) , diffraction , ion , materials science , burgers vector , irradiation , crystallography , molecular physics , optics , condensed matter physics , physics , chemistry , nuclear physics , quantum mechanics , metallurgy , composite material
In a recent paper it was shown that small dislocation loops in b.c.c. metals (in this case in tungsten, irradiated with 60 keV gold ions) show under certain diffraction conditions very special contrast figures. Theoretical contrast calculations using the analytical solution of the diffraction contrast differential equations, described in part I, are applied to the interpretation of the defect images. It is shown that the contour diagrams calculated for a variety of defect configurations and diffraction conditions agree even for fine contrast details very well with the observed contrast figures of the defects. This comparison of the theoretical and observed images allows to identify Burgers vectors and habit planes of the small dislocation loops (diameters ⪅ 50 Å).