Abstract
Dislocations in an Al62Cu25.5Fe12.5 face-centered icosahedral quasicrystal were studied by means of the contrast experiment and defocus convergent-beam electron diffraction technique. The indices of the six-dimensional Burgers vector of the dislocations were determined to be 1/2[1-11-100]. The projection b(parallel-to) of this six-dimensional Burgers vector in the three-dimensional physical space is exactly parallel to a twofold axis of the icosahedron. The magnitude \b(parallel-to) = 0.291 nm was calculated when a = 0.896 nm is taken for the lattice constant of the face-centered icosahedral phase.
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