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FIM analysis of dislocation core structure
Author(s) -
Brandon D. G.,
Melmed A. J.
Publication year - 1974
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.1974.tb03914.x
Subject(s) - spiral (railway) , dislocation , core (optical fiber) , superposition principle , field (mathematics) , field ion microscope , materials science , optics , physics , ion , molecular physics , condensed matter physics , mathematics , mathematical analysis , quantum mechanics , pure mathematics
Summary A direct colour superposition technique has been used to study two dislocations in W, using He field‐ion imaging at 77°K. Limitations due to instrumentation and field‐ion microscopy are discussed. A single spiral and a double spiral on (112) W were each dissected, by field evaporation, through three successive atom layers, and apparent core shapes and dimensions were determined. The shapes were irregular with diameters of at most 0.5–2 nm for the single spiral and 0.5–1.7 nm for the double spiral. Observed displacements in the positions of the core regions may be associated with dislocation movement induced by the high electric field needed for the observations.