Simulations were made of the detailed structure of an interstitial in this body-centered cubic metal by using molecular dynamics and the embedded-atom method. Several distinct configurations could be identified. These included the well-known split-interstitial <011> dumb-bell. The <111> crowdion was also observed, as was a set of similar 1-dimensional defect configurations. These were grouped into a classification scheme, in which the traditional crowdion was seen to be part of a whole family. The defect energies of the various configurations were computed. The <011> dumb-bell was the energetically most favorable configuration, and was found to have a radius of about one W lattice constant (0.316nm).

Self-Interstitial Structures in Body-Centered Cubic W Studied by Molecular Dynamics Simulation. M.H.Carlberg, E.P.Münger, L.Hultman: Journal of Physics - Condensed Matter, 1999, 11[34], 6509-14