Abstract
Long dislocations of 1-2 mm length in an Al62Cu25.5Fe12.5 icosahedral quasi-crystal (IQC) were investigated by means of white-beam synchrotron radiation X-ray topography for the first time. The direction of the Burgers vector of a dislocation was determined by the invisibility condition to be parallel to the six-dimensional vector 1/2 (0, -1, 1, -1, 0, 1), the physical subspace component of which is parallel to a two-fold axis of the IQC. This result is consistent with that determined by a transmission electron microscopy study.
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