Abstract
The Bragg diffraction contrast of dislocations in icosahedral quasicrystals observed by transmission electron microscopy was investigated both theoretically and experimentally. It was found that, due to the special structural features of dislocations in quasiperiodic lattices, the contrast vanishes under two basically different diffraction conditions. Quantitative evaluation of the experimental results indicates that the phason component of the dislocation strain field is substantially stronger than the phonon component.
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