We report for the first time experimental evidence for the existence of dislocations in an Al-Mn-Si icosahedral quasicrystal. By many-beam electron microscopy, the Burgers vectors on the plane perpendicular to the five-fold symmetry axis have been determined as the displacement of lattice planes or bright-dot alignments around the dislocation cores. The observed results are briefly discussed in comparison with a theoretical prediction by Levine et al.
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Hiraga et al. (1987) studied this question.
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