A THEORETICAL AND EXPERIMENTAL-ANALYSIS OF HIGHER-ORDER LAUE ZONE LINE SPLITTINGS CAUSED BY A DISLOCATION IN AN ICOSAHEDRAL QUASI-CRYSTAL

Twelve convergent-beam electron diffraction patterns from an icosahedral phase specimen containing a dislocation along 12 different zone axes, which are equivalent according to icosahedral symmetry, have been photographed and simulated using dynamical theory. The splitting behaviours of higher-order Laue zone lines in these patterns have been analysed in detail. Some deviations between the experimental and theoretical patterns can be explained because the incident probe becomes too close to the dislocation core.