The structural relationship between the µ- and λ-phases, which were approximants of icosahedral and decagonal quasicrystals, respectively, was studied from the viewpoint of modulated structures. The difference between these phases was attributed to a difference in the ordered arrangements of atomic vacancies in the close-packed layers. The modulation was considered to be due to rearrangement of the atomic vacancies, in response to the occurrence of charge-density waves.

Structural Relationship between the μ Phase and the λ Phase in the Al-Mn System. M.Uchida, Y.Matsui: Philosophical Magazine A, 2001, 81[9], 2121-6