Dislocations in quasicrystals and their interaction with cluster-like obstacles

Details Dislocations in quasicrystals and their interaction with cluster-like obstacles Dislocations in quasicrystals and their interaction with cluster-like obstacles

1997-08-14

arxiv.org/abs/cond-mat/9708102v2

Physics

Condensed Matter

Materials Science

4 pages, 4 figures, to be published in Phil. Mag. Lett., several small changes to enhance the clairity of the paper

Scientific paper

A dislocation moving through a quasicrystal is leaving in its wake a fault denoted phason wall. For a two-dimensional model quasicrystal the disregistry energy of this phason wall is studied to determine possible Burgers vectors of the quasicrystalline structure. Contrary to periodic crystals, the disregistry energy is an average quantity with large fluctuations on the atomic scale. Therefore the dislocation core structure and mobility cannot be linked to this quantity e.g. by a Peierls-Nabarro model. Atomistic simulations show that dislocation motion is controlled by local obstacles inherent to the atomic structure of the quasicrystal.

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