Phason is a quasiparticle existing in quasicrystals due to their specific, quasiperiodic lattice structure. Similar to phonon, phason is associated with atomic motion. However, whereas phonons are related to translation of atoms, phasons are associated with atomic rearrangements. As a result of these rearrangements, waves, describing the position ...
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http://en.wikipedia.org/wiki/Phason
(from the article `quasicrystal`) As a consequence of the translational quasiperiodicity, there exists a second type of elastic deformation beyond the ordinary sound wave, or phonon. ...
Found on
http://www.britannica.com/eb/a-z/p/54
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