Abstract
The structure of a quasicrystal is characterized by quasiperiodic translational order and by a point group symmetry that is not allowed in conventional crystallography [1, 2, 3]. Much theoretical and experimental work has been done to determine the atomic structure in this new class of ordered state. Experimentally, in addition to X-ray diffractometry, which is a standard tool for crystal structure determination, microscopic techniques such as high-resolution transmission electron microscopy (HRTEM) have been utilized effectively; HRTEM gives direct information about the local structure, which is complementary to that obtained from X-ray diffractometry.
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