Characterization and visualization of the lattice misfit associated with dislocation cores
- Air Force Office of Scientific Research, Directorate of Aerospace and Materials Sciences, 4015 Wilson Blvd., Arlington, VA 22203-1954 (United States)
- School of Computational Sciences, George Mason University, 4400 University Drive, Fairfax, VA 22030-4444 (United States)
Atomic misfit associated with a crystal dislocation is manifested by displacements of atoms from their positions in the perfect lattice. The discrete character of the crystal lattice and the nature of interatomic bonds distribute this misfit over the plane normal to the dislocation line. The Nye tensor, which describes the distribution of the resultant Burgers vector across a plane normal to the dislocation line, provides an excellent means of describing the spatial variation of the misfit. Relevant components of the Nye tensor are calculated from atomic positions in the dislocated crystal, represented by contour plots, and contrasted with the corresponding quantities obtained from a local continuum model. The comparison demonstrates that spatial distributions of components of the Nye tensor provide an accurate and instructive means of representing dislocation core structures. A numerical integration of these distributions permits an accurate calculation of the Burgers vector without constructing a Burgers circuit.
- OSTI ID:
- 20637161
- Journal Information:
- Acta Materialia, Vol. 53, Issue 5; Other Information: DOI: 10.1016/j.actamat.2004.11.027; PII: S1359-6454(04)00706-2; Copyright (c) 2004 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 1359-6454
- Country of Publication:
- United States
- Language:
- English
Similar Records
Unique x-ray diffraction pattern at grazing incidence from misfit dislocations in SiGe thin films
Reorientation of misfit dislocations during annealing in InGaAs/GaAs(001) interfaces