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The entropic form of phason elasticity is observed in a molecular-dynamics simulation utilizing a realistic model of an equilibrium dodecagonal quasi-crystal. The simulation reveals local phason fluctuations, connecting degenerate structural units, which are concluded to provide the entropy stabilizing the structure. It is found that vacancies play a crucial role in the phason flips, acting as catalyzing agents. The phason dynamics observed gives rise to a novel form of atomic diffusion which demonstrates Arrhenius behaviour within a range of temperatures.
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Mikhail Dzugutov (1995) studied this question.
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