Premium
Higher‐order Laue zone line contrast in large‐angle convergent‐beam electron diffraction around a dislocation
Author(s) -
Toda A.,
Ikarashi N.,
Ono H.
Publication year - 2001
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 - 10.1046/j.1365-2818.2001.00938.x
Subject(s) - dislocation , diffraction , burgers vector , optics , zone axis , electron diffraction , displacement field , physics , line (geometry) , condensed matter physics , geometry , mathematics , finite element method , thermodynamics
The physical picture of higher‐order Laue zone (HOLZ) line contrast in a large‐angle convergent‐beam electron diffraction pattern around a dislocation, which is used for determining the Burgers vector, was examined. To evaluate the analytical expression of diffracted wave amplitude, we introduced an approximate form of the atomic displacement field of a dislocation. We showed that the four features of the HOLZ line contrast, that is, splitting, fading, bending and periodical contrast can be explained by analysis of the atomic displacement field. The localized lattice plane bending around a dislocation core made a HOLZ line split, fade and bend. However, we found that the periodical contrast of a HOLZ line was produced by the change of phase difference of the atomic displacement field between the crystals above and below the slip plane across the dislocation line.