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Anomalous transmission of x-rays in quasicrystals

The perfection of one of the quasicrystal grains with the highest degrees of perfection was checked by means of x-ray diffractometry and x-ray topography. Full widths at half maximum of de-convoluted reflectivity curves were close to the theoretical values and a partial Borrmann effect was clearly visible in the measured reflection and transmission curves, whereas the topographs still showed rather strong intricate contrast, which means that strong deformations (defects) still exist in the grain. Consequently, dynamical effects like anomalous transmission were confirmed to exist in selected quasicrystalline grains, but even then the structural quality is still far from being `highly perfect'.