The development of dislocation-core models in metals with non close-packed crystalline structures was reviewed. The Peierls-Nabarro model was first generalized to the case of non-planar cores so as to describe dislocation-splitting in body-centered cubic metals. Atomistic studies of dislocations cores in body-centered cubic metals and intermetallic compounds with the L12 or B2 structure were then considered, and the principal features of non-planar cores were emphasized. Finally, an analogy between dislocations in solids and disclinations in liquid crystals was presented and similarities and differences in the treatment of the core structures of these defects in solids and in liquid crystals were compared.

Models of the Cores of Dislocations in Metals and Disclinations in Liquid Crystals. V.Vitek, L.Lejcek, V.Paidar: Czechoslovak Journal of Physics, 1995, 45[11], 1003-18