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VOLUME 56 (1992) | ISSUE 8 | PAGE 395
Formation of phason defects during "geometric" roughening of the surface of a growing quasicrystal
The layer-by-layer growth of an icosahedral quasicrystal from the melt is analyzed in a study of the stability of the growing face. At certain degrees of supercooling, seeds of a periodic crystal (with the approximant structure), whose height differs from the thickness of a completed quasicrystal layer, can arise on this growing face. The result may be a "geometric" roughening of the surface, accompanied by the appearance of a phason disorder, as has been observed in diffraction experiments.